Rules

Rules are inserted at first start, then belong to you: DumbMonit never rewrites a rule you changed, it only recreates missing ones. Built-in rules can be edited and disabled, not deleted.

Built-in rules

Severities are shown with the UI word; the API value is in parentheses. A rule whose metric no monitor produces has no series and never fires, so every rule below is shipped enabled on every instance.

Every monitor

Rule	What	Default threshold	Hold	Severity	Reminder
Monitor unreachable	No measurement received for more than three minutes. bottomk by (target) (1, time() - tlast_over_time(dumbmonit_up[7d]))	> 180 s	1 min	Warning (critical)	6 h
High CPU	CPU load sustained above 90%, averaged per monitor across SNMP, Proxmox and agent sources; clears below 85 %.	> 90 %	10 min	Advisory (warning), escalates after 1 h	6 h
Unusual CPU	CPU load noticeably different from the usual at this time and day of the week (seasonal baseline).	score > 3.5	15 min	Info (info)	6 h
Disk almost full	Filesystem 90% full or more, per mount point (SNMP, Proxmox storages and root filesystems); clears below 88 %.	≥ 90 %	15 min	Advisory (warning), escalates after 24 h	6 h
Filesystem almost full	At this rate, the filesystem will be full within four days (predict_linear over 6 h; rising filesystems only).	≥ 100 %	30 min	Advisory (warning)	6 h

UPS

Rule	What	Default threshold	Hold	Severity	Reminder
UPS on battery	The UPS is powering the load from battery (dumbmonit_ups_output_source == 5).	> 0	30 s	Warning (critical)	15 min
UPS battery low	The UPS battery is low or depleted (dumbmonit_ups_battery_status, 3 = low, 4 = depleted).	≥ 3	1 min	Warning (critical)	30 min

Network ports (SNMP)

Rule	What	Default threshold	Hold	Severity	Reminder
Port accumulating errors	A network port logged more than fifty errors in the last hour: usually a failing cable, a dirty fibre or a duplex mismatch (increase_prometheus(dumbmonit_if_errors_in[1h]) + increase_prometheus(dumbmonit_if_errors_out[1h]); nothing fires during the first hour of a new monitor, so errors counted before it was added are not reported as new).	> 50	15 min	Advisory (warning)	24 h
Port flapping	A network port went down and up again more than twice in thirty minutes (changes_prometheus(dumbmonit_if_oper_status[30m])). A port disabled on purpose has no series and never fires.	> 4	5 min	Advisory (warning)	1 h

Server hardware (Redfish)

Health series are 0 (OK), 1 (Warning) or 2 (Critical). An empty slot (Absent) or a disabled one has no series, so a server delivered with one power supply out of two never fires.

Rule	What	Default threshold	Hold	Severity	Reminder
Server fan failed	The management controller reports a fan as failed (dumbmonit_redfish_fan_health).	≥ 2	2 min	Warning (critical)	6 h
Server temperature above critical	A temperature sensor is above the critical threshold the controller itself declares (dumbmonit_redfish_temperature_celsius >= dumbmonit_redfish_temperature_upper_critical_celsius).	> 0	5 min	Warning (critical)	6 h
Power supply redundancy lost	The power supplies are no longer redundant: one more failure and the server goes down (dumbmonit_redfish_power_redundancy_health).	≥ 1	5 min	Advisory (warning), escalates after 1 h	6 h
Power supply failed	The controller reports a power supply as failed (dumbmonit_redfish_psu_health).	≥ 2	2 min	Warning (critical)	6 h
Drive failure predicted	A drive reports a predicted failure: replace it while it still works (dumbmonit_redfish_drive_failure_predicted).	> 0	10 min	Advisory (warning)	24 h
Server health critical	The controller reports the system’s own health as Critical (dumbmonit_redfish_system_health).	≥ 2	2 min	Warning (critical)	6 h

Uptime monitors and heartbeats

Rule	What	Default threshold	Hold	Severity	Reminder
Service down	The service has not responded correctly for three minutes (dumbmonit_probe_success{probe!="push"} == bool 0).	> 0	3 min	Warning (critical)	30 min
Heartbeat missed	The job has not called in within its expected interval plus grace period, or reported a failure itself (dumbmonit_probe_success{probe="push"} == bool 0; the delay is set per monitor, see Heartbeat).	> 0	2 min	Advisory (warning)	6 h
Service flapping	The service changed state more than six times in thirty minutes (changes(dumbmonit_probe_success{probe!="push"}[30m])).	> 6	5 min	Advisory (warning)	1 h
Slow service	The service takes more than three seconds to respond; failed checks are left out (dumbmonit_probe_duration_seconds and dumbmonit_probe_success == 1).	> 3 s	10 min	Advisory (warning)	6 h
Certificate expiring soon	The certificate expires in less than fourteen days.	< 14 d	1 h	Advisory (warning)	24 h
Certificate expired	The certificate has expired.	< 0 d	5 min	Warning (critical)	24 h

Docker containers

Reported by the agent; see Agent. The alert names the container.

Rule	What	Default threshold	Hold	Severity	Reminder
Container stopped	The container has been stopped for two minutes (dumbmonit_container_up == bool 0). A container Docker would not restart is left out (dumbmonit_container_stop_expected = 1): a one-shot docker run that finished, a container never started, or one stopped by hand without a restart policy. A crash (any other exit code), an out-of-memory kill, or an always / unless-stopped container still counts.	> 0	2 min	Advisory (warning)	1 h
Container unhealthy	The container’s health check has been failing for three minutes (dumbmonit_container_health == 2; 0 none, 1 healthy, 3 starting). A stopped container is left out: Docker keeps its last verdict, which no longer means anything.	> 0	3 min	Advisory (warning)	1 h
Container restarting	The container restarted three times or more in fifteen minutes (increase(dumbmonit_container_restart_count[15m])): it is rarely stopped long enough for the previous rule.	≥ 3	1 min	Advisory (warning)	1 h
Container update available	A newer image is available in the registry for this container (dumbmonit_container_update_available == 1).	> 0	1 h	Info (info)	24 h

Plakar backups

Reported by the agent, per kloset and per source. None of these series exists while Plakar is not detected, so neither rule can fire on a machine without it.

Rule	What	Default threshold	Hold	Severity	Reminder
Plakar backup too old	No new Plakar snapshot for this source for more than two days (dumbmonit_backup_last_success_seconds).	> 2 d	1 h	Advisory (warning)	24 h
Plakar backup failed	The latest snapshot has errors (dumbmonit_backup_last_status{source!="*"} < 1).	< 1	10 min	Warning (critical)	24 h
Plakar kloset unreadable	The agent cannot open the kloset: storage unreachable, passphrase or plugin missing; the agent’s log says which, once (dumbmonit_backup_last_status{source="*"} < 1).	< 1	30 min	Advisory (warning)	24 h

restic and Borg backups

Reported by the agent for each repository declared under restic_repos or borg_repos in agent.yaml; see Agent. Without a declared repository there is no series, so neither rule can fire.

Rule	What	Default threshold	Hold	Severity	Reminder
restic/Borg backup too old	No new restic or Borg snapshot in this repository for more than 48 hours (dumbmonit_agent_backup_repo_last_snapshot_age_seconds).	> 48 h	1 h	Advisory (warning)	24 h
restic/Borg repository unreachable	The agent cannot read the repository: unreachable, password refused or binary missing; the agent’s log says which (dumbmonit_agent_backup_repo_reachable < 1).	< 1	30 min	Advisory (warning)	24 h

WireGuard tunnels

Reported by the agent; see Agent.

Rule	What	Default threshold	Hold	Severity	Reminder
WireGuard peer silent	A peer with a persistent keepalive has not completed a handshake for more than 15 minutes: the tunnel is down (dumbmonit_agent_wireguard_peer_handshake_age_seconds and on (target, interface, peer) dumbmonit_agent_wireguard_peer_keepalive_seconds > 0). A peer that never connected counts its silence from the moment the agent first saw it. Peers without keepalive (a phone, a laptop) idle for days and are left out; change the threshold to change N, or drop the and on … part to watch every peer.	> 15 min	5 min	Advisory (warning)	6 h

IPsec tunnels

Reported by the agent; see Agent. The series exists only for a CHILD_SA declared in the strongSwan configuration, so the rule fires on a tunnel that never came up, not only on one that dropped.

Rule	What	Default threshold	Hold	Severity	Reminder
IPsec tunnel down	A configured IPsec tunnel has no installed session (dumbmonit_agent_ipsec_tunnel_up < 1).	< 1	10 min	Advisory (warning)	6 h

Internet speed test

Reported by the agent; see Agent. The test is off by default and each rule stays silent until the matching threshold is set in agent.yaml: nobody can guess what “slow” means for your line.

Rule	What	Default threshold	Hold	Severity	Reminder
Internet download rate low	The last test measured a download rate below speedtest_min_download_mbps (dumbmonit_agent_speedtest_download_min_bytes_per_second - dumbmonit_agent_speedtest_download_bytes_per_second > 0).	> 0	10 min	Advisory (warning)	24 h
Internet upload rate low	Same, for speedtest_min_upload_mbps.	> 0	10 min	Advisory (warning)	24 h
Internet latency high	The last test measured a latency above speedtest_max_latency_ms.	> 0	10 min	Advisory (warning)	24 h

Windows event log

Raised by the event log rules of a Windows agent machine; see Windows event log alerts. No event log rule exists by default, so these rules stay silent until you add one. One alert per machine and severity, quoting the latest event; it speaks again at most every 10 minutes while events keep coming, and resolves 15 minutes after the last one.

Rule	What	Default threshold	Hold	Severity	Reminder
Windows event (critical)	An event matched a rule of severity Warning (dumbmonit_agent_eventlog_matches_critical: events in the last 15 minutes).	> 0	30 s	Warning (critical)	none
Windows event (warning)	Same, for rules of severity Advisory (dumbmonit_agent_eventlog_matches_warning).	> 0	30 s	Advisory (warning)	none
Windows event (info)	Same, for rules of severity Info (dumbmonit_agent_eventlog_matches_info).	> 0	30 s	Info (info)	none

Agent disks, ZFS and sensors

Reported by the agent; see Agent.

Rule	What	Default threshold	Hold	Severity	Reminder
Disk SMART failing	The disk’s own SMART self-assessment reports it as failing (dumbmonit_agent_disk_smart_ok == bool 0). Replace it and check the backups.	> 0	10 min	Warning (critical)	24 h
ZFS pool degraded	A ZFS pool is no longer healthy: a device is missing, faulted or removed (dumbmonit_agent_zfs_pool_health: 0 online, 1 degraded, 2 anything else).	> 0	5 min	Warning (critical)	6 h
ZFS scrub found errors	The last ZFS scrub found errors on this pool, or files are permanently lost (dumbmonit_agent_zfs_pool_scrub_errors or dumbmonit_agent_zfs_pool_data_errors). The pool can stay ONLINE.	> 0	10 min	Warning (critical)	24 h
Temperature above critical	A sensor is above the critical temperature its own hardware declares (dumbmonit_agent_sensor_temperature_celsius >= dumbmonit_agent_sensor_temperature_critical_celsius); no fixed value.	> 0	5 min	Warning (critical)	6 h

Proxmox VE

Rule	What	Default threshold	Hold	Severity	Reminder
Backup too old	No successful Proxmox VE backup for more than seven days (dumbmonit_proxmox_backup_last_age_seconds).	> 7 d	1 h	Advisory (warning)	24 h
VM or container stopped	The guest was running within the last two hours and has been stopped for five minutes (1 - dumbmonit_proxmox_guest_running, and’d with max_over_time(…[2h]) == 1).	> 0	5 min	Advisory (warning)	6 h
VM or container CPU high	A guest has used more than 90 % of its allocated cores for fifteen minutes (dumbmonit_proxmox_guest_cpu_percent). The notification names the guest, nextcloud (202).	> 90 %	15 min	Advisory (warning)	6 h
VM or container memory high	A guest has used more than 95 % of its memory for ten minutes (dumbmonit_proxmox_guest_memory_percent).	> 95 %	10 min	Advisory (warning)	6 h
VM or container disk almost full	The root disk of a guest is more than 90 % full (dumbmonit_proxmox_guest_disk_used_percent): containers always, VMs only when the QEMU guest agent reports usage.	> 90 %	15 min	Advisory (warning)	24 h
Guest locked	A VM or container has been locked for six hours (dumbmonit_proxmox_guest_locked, label lock): an interrupted backup or migration left the lock behind and no operation can run on the guest, not even the next backup.	> 0	6 h	Advisory (warning)	24 h
Old snapshot	The oldest snapshot of a guest is more than thirty days old (dumbmonit_proxmox_guest_snapshot_oldest_age_seconds).	> 30 d	1 h	Info (info)	7 d
HA resource in error	A Proxmox HA resource is in error or fenced (dumbmonit_proxmox_ha_resource_error).	> 0	2 min	Warning (critical)	1 h
HA manager not reporting	The HA local resource manager of a node has stopped writing its state (dumbmonit_proxmox_ha_lrm_stale): that node’s HA guests will be neither restarted nor relocated.	> 0	5 min	Warning (critical)	1 h
Cluster lost quorum	The Proxmox cluster is not quorate (1 - dumbmonit_proxmox_cluster_quorate): guests can no longer be started.	> 0	1 min	Warning (critical)	30 min
Proxmox node offline	A cluster node is reported offline (1 - dumbmonit_proxmox_node_up).	> 0	2 min	Warning (critical)	30 min
Proxmox service down	A core Proxmox daemon is not running on a node (dumbmonit_proxmox_node_core_services_down: pve-cluster, pvedaemon, pveproxy, pvestatd, pve-firewall, corosync, watchdog-mux, each counted only where the node enables it).	> 0	5 min	Warning (critical)	1 h
Node network interface down	An interface set to start at boot is not up on a node (dumbmonit_proxmox_node_interface_offline). An interface brought up on demand is never reported.	> 0	5 min	Advisory (warning)	6 h
Proxmox storage almost full	A Proxmox storage is more than 85% full (dumbmonit_proxmox_storage_used_percent); “Disk almost full” takes over at 90%.	> 85 %	15 min	Advisory (warning)	24 h
Thin pool almost full	An LVM thin pool is more than 90 % full: every guest stored on it goes read-only when it fills (dumbmonit_proxmox_node_thinpool_used_percent); clears below 88 %.	> 90 %	15 min	Warning (critical)	6 h
Thin pool metadata almost full	The metadata volume of an LVM thin pool is more than 80 % full (dumbmonit_proxmox_node_thinpool_metadata_used_percent). It is far smaller than the data volume and often saturates first, with the same consequence.	> 80 %	15 min	Warning (critical)	6 h
Proxmox disk wearing out	An SSD or NVMe of a node has used more than 90 % of its rated life (dumbmonit_proxmox_node_disk_wearout_percent). The notification reads pve1 · /dev/nvme0n1.	> 90 %	1 h	Advisory (warning)	7 d
Proxmox disk SMART failure	A disk of a node reports SMART health FAILED (dumbmonit_proxmox_node_disk_smart_failed).	> 0	5 min	Warning (critical)	24 h
Proxmox ZFS pool degraded	A ZFS pool of a node is not ONLINE (dumbmonit_proxmox_node_zfs_pool_degraded). The notification reads pve2 · tank.	> 0	5 min	Warning (critical)	6 h
Backup job failed	The last vzdump job on a node, or a scheduled backup job, failed (1 - dumbmonit_proxmox_backup_job_last_ok).	> 0	10 min	Warning (critical)	24 h
Backup job excludes a disk	A scheduled backup job skips a disk of one of the guests it covers (dumbmonit_proxmox_backup_job_guest_excluded_volumes): the job succeeds every night with that data missing. CD-ROM drives and cloudinit images are excluded by design and never counted.	> 0	1 h	Advisory (warning)	7 d
Replication failed	A replication job reports an error or a non-zero fail count (dumbmonit_proxmox_replication_job_error): the standby copy is stale.	> 0	10 min	Warning (critical)	6 h
Ceph health error	Ceph reports HEALTH_ERR (dumbmonit_proxmox_ceph_health, 0 OK, 1 WARN, 2 ERR).	≥ 2	2 min	Warning (critical)	30 min
Ceph health warning	Ceph reports HEALTH_WARN for more than fifteen minutes (dumbmonit_proxmox_ceph_health == 1).	> 0	15 min	Advisory (warning)	6 h
Ceph OSD down	A Ceph OSD has been down for five minutes (1 - dumbmonit_proxmox_ceph_osd_up). The notification names the OSD and its host.	> 0	5 min	Warning (critical)	1 h
Ceph OSD nearly full	A single Ceph OSD is more than 85 % full (dumbmonit_proxmox_ceph_osd_used_percent): writes stop when it reaches its limit, whatever the cluster average says; clears below 82 %.	> 85 %	15 min	Advisory (warning)	24 h
Ceph pool almost full	A Ceph pool is more than 85 % full (dumbmonit_proxmox_ceph_pool_used_percent); clears below 82 %.	> 85 %	15 min	Advisory (warning)	24 h
Ceph noout flag left on	The Ceph noout flag has been set for two hours (dumbmonit_proxmox_ceph_flag{flag="noout"}): rebalancing is disabled, and the cluster reads healthy while its redundancy shrinks.	> 0	2 h	Info (info)	24 h
Proxmox updates pending	More than twenty package updates are pending on a node (dumbmonit_proxmox_node_updates_pending).	> 20	1 h	Info (info)	7 d
Proxmox security updates pending	At least one pending update comes from a security archive (dumbmonit_proxmox_node_updates_security_pending).	> 0	1 h	Advisory (warning)	7 d
Proxmox packages changed	The installed version of a Proxmox package changed between two probes — someone ran apt upgrade (dumbmonit_proxmox_node_packages_changed, published for one hour with the detail in its changes label: pve1 · pve-manager 8.2.4→8.2.7). Resolves by itself an hour later.	> 0	1 min	Info (info)	24 h
Node certificate expiring	A Proxmox node certificate expires in less than fourteen days (dumbmonit_proxmox_node_certificate_expiry_days).	< 14 d	1 h	Advisory (warning)	24 h

Proxmox Backup Server

Rule	What	Default threshold	Hold	Severity	Reminder
PBS datastore almost full	PBS datastore more than 90% full.	> 90 %	15 min	Advisory (warning), escalates after 24 h	6 h
PBS datastore filling up	At the current rate, PBS estimates the datastore full within seven days.	< 7 d	1 h	Advisory (warning)	24 h
PBS datastore not mounted	A removable datastore is not mounted (dumbmonit_pbs_datastore_removable_unmounted): nothing can be written to it.	> 0	6 h	Advisory (warning)	24 h
PBS backup too old	No new snapshot for this backup group (one per machine) for more than two days (dumbmonit_pbs_backup_last_age_seconds). Edit the threshold for machines backed up weekly; the notification names the group and datastore.	> 2 d	1 h	Advisory (warning)	24 h
PBS backup verification failed	Verification of the latest snapshot for this machine failed (dumbmonit_pbs_backup_last_verified < 1).	< 1	30 min	Warning (critical)	24 h
PBS task failed	At least one PBS task failed in the review window (dumbmonit_pbs_tasks_failed).	> 0	10 min	Advisory (warning)	24 h
PBS garbage collection too old	No successful garbage collection on this datastore for more than eight days (dumbmonit_pbs_gc_last_success_age_seconds).	> 8 d	1 h	Advisory (warning)	24 h
PBS garbage collection failed	The last garbage collection on a datastore failed (dumbmonit_pbs_gc_last_run_ok < 1; from /gc on PBS 3.3+, from the latest GC task before).	< 1	10 min	Advisory (warning)	24 h
PBS corrupt chunks found	The garbage collection found unreadable chunks on a datastore (dumbmonit_pbs_gc_bad_chunks): some backups can no longer be restored.	> 0	10 min	Warning (critical)	24 h
PBS prune job failed	The last run of a PBS prune job failed: nothing is pruned and the datastore keeps filling up (dumbmonit_pbs_job_last_ok{kind="prune"} < 1). The notification names the job and datastore.	< 1	10 min	Advisory (warning)	24 h
PBS verification job failed	The last run of a PBS verification job failed (dumbmonit_pbs_job_last_ok{kind="verify"} < 1).	< 1	10 min	Advisory (warning)	24 h
PBS sync job failed	The last run of a PBS sync job failed (dumbmonit_pbs_sync_job_last_ok < 1).	< 1	10 min	Warning (critical)	24 h
PBS tape backup failed	The last tape backup run failed (dumbmonit_pbs_tape_backup_job_last_ok < 1): the offline copy is not being made.	< 1	10 min	Warning (critical)	24 h
PBS job never ran	A job is enabled and scheduled but has never run (dumbmonit_pbs_job_never_run).	> 0	2 d	Advisory (warning)	7 d
PBS service down	A service Proxmox Backup Server needs is not running (dumbmonit_pbs_node_service_active{expected="1"} < 1); no backup can be taken in while it is down.	< 1	5 min	Warning (critical)	6 h
PBS disk SMART failure	A disk of the backup server reports SMART health FAILED (dumbmonit_pbs_node_disk_smart_failed). The notification reads /dev/sdb.	> 0	5 min	Warning (critical)	24 h
PBS SSD worn out	An SSD of the backup server has used more than 90 % of its rated endurance (dumbmonit_pbs_node_disk_wearout_percent).	> 90 %	1 h	Advisory (warning)	7 d
PBS ZFS pool degraded	A ZFS pool of the backup server is not ONLINE (dumbmonit_pbs_node_zfs_pool_degraded).	> 0	5 min	Warning (critical)	6 h
PBS certificate expiring	The certificate served by the backup server expires in less than three weeks (dumbmonit_pbs_node_certificate_expires_seconds). Needs the certificates option.	< 21 d	1 h	Advisory (warning)	48 h
PBS restart pending after upgrade	The package was upgraded but the running daemon is still the old one (dumbmonit_pbs_node_running_version_stale).	> 0	6 h	Info (info)	7 d
PBS updates pending	More than twenty package updates are pending on the backup server (dumbmonit_pbs_node_updates_pending).	> 20	1 h	Info (info)	7 d

Proxmox Datacenter Manager

Rule	What	Default threshold	Hold	Severity	Reminder
Federated instance unreachable	The datacenter console cannot reach one of the Proxmox VE clusters or backup servers it federates (dumbmonit_pdm_remote_reachable < 1). The notification names the instance and its product.	< 1	10 min	Warning (critical)	6 h
Federated instance behind	An instance runs an older version than another instance of the same product in the same estate (dumbmonit_pdm_remote_version_behind). Compared between instances, never against what Proxmox publishes.	> 0	1 h	Info (info)	7 d
Task failed on a federated instance	At least one task failed on a federated instance in the review window (dumbmonit_pdm_remote_tasks_failed).	> 0	10 min	Advisory (warning)	24 h
Datacenter console disk almost full	The root filesystem of the datacenter console is more than 90 % full (dumbmonit_pdm_node_rootfs_percent): full, the console stops recording what it collects.	> 90 %	15 min	Advisory (warning), escalates after 24 h	6 h
Datacenter console certificate expiring	A certificate of the datacenter console expires in less than fourteen days (dumbmonit_pdm_node_certificate_expiry_days).	< 14 d	1 h	Advisory (warning)	24 h
Datacenter console updates pending	More than twenty package updates are pending on the datacenter console (dumbmonit_pdm_node_updates_pending).	> 20	1 h	Info (info)	7 d

Proxmox Mail Gateway

Rule	What	Default threshold	Hold	Severity	Reminder
Mail queue growing	The deferred mail queue has grown by more than a hundred messages in two hours (delta(dumbmonit_pmg_queue_messages{queue="deferred"}[2h])): the next hop is probably refusing mail. Growth rather than size, because a busy gateway always keeps a few dozen deferred.	> 100	15 min	Advisory (warning)	6 h
Mail stuck in the queue	A message has been waiting in a queue for more than four hours (dumbmonit_pmg_queue_oldest_age_seconds). The age is a lower bound — qshape reports brackets — so the rule fires late rather than early. The notification names the queue.	> 4 h	15 min	Warning (critical)	6 h
Mail gateway service stopped	A service the gateway needs to accept and filter mail is stopped (dumbmonit_pmg_service_running for postfix, pmg-smtp-filter, pmgpolicy, pmgproxy, pmgdaemon). A unit that is not installed has no series and cannot fire.	< 1	5 min	Warning (critical)	6 h
Virus signatures out of date	The ClamAV daily virus signatures are more than two days old (dumbmonit_pmg_signature_age_seconds{family="virus",database="daily"}): freshclam has stopped updating them and the gateway keeps filtering with last week’s list.	> 2 d	1 h	Advisory (warning)	24 h
Spam rules out of date	The SpamAssassin rules are more than eight days old (dumbmonit_pmg_signature_age_seconds{family="spam"}). A channel that has never been updated has no date and no series.	> 8 d	1 h	Advisory (warning)	7 d
Quarantine filling up	The spam quarantine has taken in more than a thousand messages in six hours (delta(dumbmonit_pmg_quarantine_messages{kind="spam"}[6h])): a campaign, or a rule that just put a legitimate domain in the bin.	> 1000	30 min	Advisory (warning)	12 h
Mail gateway cluster degraded	A gateway of the cluster is no longer in sync with the others (dumbmonit_pmg_cluster_node_insync): it filters with an out-of-date rule database. A standalone gateway has no series.	< 1	15 min	Advisory (warning)	6 h
Mail gateway certificate expiring	A certificate of the mail gateway expires in less than fourteen days (dumbmonit_pmg_certificate_expires_in_seconds).	< 14 d	1 h	Advisory (warning)	24 h
Mail gateway updates pending	More than twenty package updates are pending on the mail gateway (dumbmonit_pmg_node_updates_pending).	> 20	1 h	Info (info)	7 d

MDaemon and SecurityGateway

Rule	What	Default threshold	Hold	Severity	Reminder
MDaemon mail service down	A watched mail service of the MDaemon server does not answer, or greets to refuse service (dumbmonit_mdaemon_service_up). Only the services listed on the monitor have a series. The notification names the service and its port.	< 1	5 min	Warning (critical)	6 h
MDaemon XML API not answering	The XML API has stopped answering while the mail services still do (dumbmonit_mdaemon_api_up): Remote Administration is probably stopped. Only a monitor with an account has the series.	< 1	15 min	Advisory (warning)	12 h
MDaemon mail queue growing	The inbound, local or remote queue has grown by more than a hundred messages in two hours (delta(dumbmonit_mdaemon_queue_messages{queue=~"inbound|local|remote"}[2h])): MDaemon has stopped delivering from it. Read by the agent on the MDaemon server, so the alert is on the agent’s monitor.	> 100	15 min	Advisory (warning)	6 h
MDaemon Bad queue not empty	Messages are waiting in the Bad queue (dumbmonit_mdaemon_queue_messages{queue="bad"}): MDaemon could neither deliver nor bounce them, and they stay there until an administrator releases or deletes them.	> 0	30 min	Advisory (warning)	24 h
MDaemon Retry queue high	More than fifty messages wait in the Retry queue (dumbmonit_mdaemon_queue_messages{queue="retry"}): remote servers keep refusing mail temporarily.	> 50	1 h	Advisory (warning)	6 h
Mail server Windows service stopped	A Windows service of MDaemon or SecurityGateway that starts automatically is not running (dumbmonit_agent_mail_service_up{start="auto"}). Read by the agent on the mail server, so the alert is on the agent’s monitor. Services set to manual start or disabled do not alert.	< 1	5 min	Warning (critical)	6 h
Mail queue stuck	The oldest message of an inbound, local or remote queue has been waiting for more than two hours (dumbmonit_agent_mail_queue_oldest_seconds{queue=~"inbound|local|remote"}): the queue is frozen or delivery is blocked. Counted from the queue folders by the agent on the mail server.	> 7200 s	15 min	Advisory (warning)	6 h
MDaemon queue frozen	MDaemon reports one of its queues as frozen (dumbmonit_mdaemon_queue_frozen): it no longer processes it. Read from the performance counters by the agent on the mail server.	> 0	15 min	Advisory (warning)	6 h
SecurityGateway service down	A watched service of the gateway does not answer, or greets to refuse service (dumbmonit_securitygateway_service_up).	< 1	5 min	Warning (critical)	6 h
SecurityGateway API not answering	The REST API has stopped answering while the services still do (dumbmonit_securitygateway_api_up). Only a monitor with an API key has the series.	< 1	15 min	Advisory (warning)	12 h
SecurityGateway delivery queue growing	The delivery queue has grown by more than a hundred messages in two hours (delta(dumbmonit_securitygateway_counter{counter=~".*(delivery_queue|queued_for_delivery).*"}[2h])): the mail server behind the gateway is probably refusing mail. The counter names come from the API as they are; if your version names the queue differently, adjust the matcher.	> 100	15 min	Advisory (warning)	6 h

OPNsense

Rule	What	Default threshold	Hold	Severity	Reminder
Internet gateway down	dpinger no longer gets an answer from a gateway (dumbmonit_opnsense_gateway_up). On a multi-WAN firewall the traffic has already moved to another link, quietly. loss and delay are warnings, not failures, and do not fire this rule.	< 1	5 min	Warning (critical)	6 h
Gateway losing packets	A gateway is losing more than a fifth of the packets sent to it (dumbmonit_opnsense_gateway_loss_percent): the link answers, badly. Clears below 10 %.	> 20 %	10 min	Advisory (warning)	6 h
Gateway slow	A gateway’s round-trip time has stayed above 300 ms (dumbmonit_opnsense_gateway_delay_seconds). Three hundred milliseconds leaves a mobile backup link alone.	> 300 ms	15 min	Info (info)	12 h
Firewall state table filling up	pf is tracking more than 80 % of the connections it is allowed (dumbmonit_opnsense_pf_states_used_percent). Past the limit the firewall drops new connections with no other symptom.	> 80 %	10 min	Advisory (warning)	6 h
Firewall network buffers exhausted	More than 90 % of the FreeBSD network buffers are in use (dumbmonit_opnsense_mbuf_used_percent). A firewall that runs out stops forwarding with the CPU still idle.	> 90 %	10 min	Advisory (warning)	6 h
VPN tunnel down	A configured VPN tunnel has had no session for ten minutes (dumbmonit_opnsense_vpn_tunnel_up). A plugin that is not installed, or a connection that is disabled, has no series and cannot fire.	< 1	10 min	Advisory (warning)	6 h
Firewall resolver stopped	Unbound has stopped answering (dumbmonit_opnsense_unbound_running). The firewall still routes; the machines behind it no longer resolve. Turn this rule off if your firewall resolves with something else.	< 1	5 min	Advisory (warning)	6 h
Firewall core service stopped	dpinger, which watches the gateways, or configd, which runs everything else, is stopped (dumbmonit_opnsense_service_running{service=~"dpinger|configd"}). Only those two, because a service switched off on purpose is not a failure.	< 1	5 min	Warning (critical)	6 h
Firewall too hot	A sensor reads above 85 °C (dumbmonit_opnsense_temperature_celsius): the fanless box in the cupboard is about to start throttling. Clears at 78 °C.	> 85 °C	10 min	Advisory (warning)	6 h
Firewall left in CARP maintenance mode	CARP has been left in persistent maintenance mode (dumbmonit_opnsense_carp_maintenance_mode): this firewall handed its virtual addresses to its partner and will not take them back on its own.	> 0	1 h	Info (info)	24 h
Firewall reboot pending	An update is installed but needs a reboot to take effect (dumbmonit_opnsense_firmware_reboot_required).	> 0	1 h	Info (info)	7 d
Firewall updates pending	The firewall has packages waiting to be updated (dumbmonit_opnsense_firmware_updates_pending). It is the most exposed machine on the network.	> 0	1 h	Info (info)	7 d

TrueNAS

Rule	What	Default threshold	Hold	Severity	Reminder
NAS pool degraded	ZFS no longer calls a pool healthy (dumbmonit_truenas_pool_healthy). A degraded pool still serves its data, which is exactly why nobody notices until the next disk fails. The monitor page names the disk.	< 1	5 min	Warning (critical)	6 h
NAS disk errors	Disks of a pool have reported read, write or checksum errors since the last zpool clear (dumbmonit_truenas_pool_device_errors, one series per kind).	> 0	15 min	Advisory (warning)	24 h
NAS pool almost full	A pool is more than 85 % full (dumbmonit_truenas_pool_used_percent). ZFS slows down well before it is full. Clears at 80 %.	> 85 %	30 min	Advisory (warning), escalates after 7 d	24 h
NAS scrub found errors	The last scrub of a pool found damaged data (dumbmonit_truenas_pool_last_scrub_errors).	> 0	5 min	Warning (critical)	24 h
NAS scrub overdue	A pool has not completed a scrub in more than 45 days (dumbmonit_truenas_pool_last_scrub_age_seconds). Absent after a resilver, which erases the record of the last scrub.	> 45 d	1 h	Info (info)	7 d
NAS disk failed its SMART test	A SMART self-test in a disk’s log failed (dumbmonit_truenas_disk_smart_failed). A disk never tested has no series.	> 0	5 min	Warning (critical)	24 h
NAS disk too hot	A disk is above 55 °C (dumbmonit_truenas_disk_temperature_celsius, read from TrueNAS’s cache). Clears at 50 °C.	> 55 °C	15 min	Advisory (warning)	6 h
NAS dataset near its quota	A dataset has used more than 90 % of its quota (dumbmonit_truenas_dataset_quota_used_percent): at 100 % its writes fail while the pool still has room. No quota, no series.	> 90 %	30 min	Advisory (warning)	24 h
NAS replication failed	An enabled replication task is in error (dumbmonit_truenas_replication_error): the copy on the other side is getting older.	> 0	10 min	Advisory (warning)	12 h
NAS snapshot task failed	An enabled periodic snapshot task is in error (dumbmonit_truenas_snapshot_task_error).	> 0	10 min	Advisory (warning)	12 h
NAS snapshots stale	An enabled periodic snapshot task has not run for more than eight days (dumbmonit_truenas_snapshot_task_last_run_age_seconds): a task that stops running does not fail, it goes quiet.	> 8 d	1 h	Advisory (warning)	24 h
TrueNAS alert raised	TrueNAS itself has raised an alert of level ERROR or above (dumbmonit_truenas_alerts). Its own sentence is on the monitor page.	> 0	10 min	Advisory (warning)	12 h
NAS service stopped	A service set to start with the NAS is stopped (dumbmonit_truenas_service_running). A service switched off on purpose has no series.	< 1	10 min	Advisory (warning)	6 h

Synology DSM

Rule	What	Default threshold	Hold	Severity	Reminder
Synology disk SMART warning	DSM no longer reports this disk’s SMART status as normal (dumbmonit_synology_disk_smart_status: 1 attention, 2 critical, unknown words count as 1).	> 0	15 min	Advisory (warning)	24 h
Synology disk failed	DSM reports the disk as crashed or failed (dumbmonit_synology_disk_status).	≥ 2	5 min	Warning (critical)	6 h
Synology disk bad sectors	The disk’s bad-sector count exceeds the threshold set in DSM (dumbmonit_synology_disk_bad_sector_exceeded).	> 0	15 min	Warning (critical)	24 h
Synology disk bad sectors growing	New unreadable sectors appeared in the last 24 hours (delta(dumbmonit_synology_disk_unc_count[24h])).	> 0	15 min	Advisory (warning)	24 h
Synology SSD wearing out	An SSD has less than 10 % of its rated life left (dumbmonit_synology_disk_remaining_life_percent); clears above 12 %.	< 10 %	1 h	Advisory (warning)	7 d
Synology volume degraded	A volume is degraded or crashed: its redundancy is gone (dumbmonit_synology_volume_status).	≥ 2	5 min	Warning (critical)	6 h
Synology storage pool degraded	A storage pool or SSD cache is degraded or crashed: a disk failed and the redundancy is gone or rebuilding (dumbmonit_synology_pool_status or dumbmonit_synology_ssd_cache_status).	≥ 2	5 min	Warning (critical)	6 h
Synology volume almost full	A volume is 90 % full or more, not counting the space reserved by thick-provisioned iSCSI LUNs (dumbmonit_synology_volume_effective_used_percent, equal to the raw usage without LUNs); clears below 88 %. A volume filled by a thick LUN is full by design and does not alert.	≥ 90 %	15 min	Advisory (warning), escalates after 24 h	6 h
Synology thin LUN over-allocation	The thin LUNs of a volume were promised more space than the volume still has free (dumbmonit_synology_volume_thin_overcommit_percent: promised and unwritten space as a percentage of the free space); clears below 95 %.	≥ 100 %	1 h	Advisory (warning)	24 h
Synology thin LUN almost full	A thin LUN has 95 % or more of its size written (dumbmonit_synology_lun_used_percent). A thick LUN is opaque from the NAS: the rules of the monitor that uses it (datastore, filesystem) alert instead.	≥ 95 %	30 min	Advisory (warning)	24 h
Synology temperature high	A disk is above 55 °C, or DSM raised its own temperature warning (dumbmonit_synology_disk_temperature_celsius, dumbmonit_synology_temperature_warning); clears below 52 °C.	> 55 °C	15 min	Advisory (warning)	6 h
Synology memory high	Memory usage of the NAS above 95 % (dumbmonit_synology_memory_usage_percent); clears below 90 %.	> 95 %	15 min	Advisory (warning)	6 h
Active Backup task failed	The last run of an Active Backup for Business task failed, or backed up only part of its devices (dumbmonit_abb_task_last_status == bool 0). The notification names the task.	> 0	10 min	Warning (critical)	24 h
Active Backup too old	No successful Active Backup for Business run for this task for more than two days (dumbmonit_abb_task_last_success_seconds). The series does not exist for a task that has never succeeded; “Active Backup task failed” speaks then.	> 2 d	1 h	Advisory (warning)	24 h
Active Backup task disabled	The task has no schedule, or its continuous backup is paused (dumbmonit_abb_task_enabled == bool 0): it will not back up anything until someone runs it.	> 0	1 h	Info (info)	7 d
Active Backup device overdue	A device has gone longer without a successful Active Backup for Business run than its own rhythm allows, off-days excluded (dumbmonit_abb_device_overdue, see Synology).	> 0	30 min	Advisory (warning)	24 h
Active Backup device failing	The last two or more attempts of a device failed (dumbmonit_abb_device_consecutive_failures); a cancelled run counts as neither.	≥ 2	10 min	Warning (critical)	24 h

Log and metrics servers

VictoriaMetrics, VictoriaLogs, Loki and Graylog (monitors). Counters go through increase_prometheus, so a server added with a history of refused data does not fire on its first measurement.

Rule	What	Default threshold	Hold	Severity	Reminder
Metrics or log storage read-only	Free disk space fell below -storage.minFreeDiskSpaceBytes and the storage refuses every write (dumbmonit_victoriametrics_read_only or dumbmonit_victorialogs_read_only).	≥ 1	2 min	Warning (critical)	1 h
Metrics or log storage almost read-only	Less than 10% of the disk left before read-only (dumbmonit_victoriametrics_disk_headroom_percent or dumbmonit_victorialogs_disk_headroom_percent); clears above 12 %.	< 10 %	30 min	Advisory (warning)	24 h
Metrics or log server unhealthy	/health does not answer OK (dumbmonit_victoriametrics_healthy or dumbmonit_victorialogs_healthy).	< 1	3 min	Warning (critical)	6 h
Metrics or log data refused	Samples or log lines refused in the last hour: timestamps outside retention, labels too long, series limit (increase_prometheus(dumbmonit_victoriametrics_rows_rejected_total[1h]) or increase_prometheus(dumbmonit_victorialogs_rows_rejected_total[1h])).	> 0	15 min	Advisory (warning)	24 h
VictoriaMetrics slow inserts	More than 5% of new samples took the slow path over 15 minutes: not enough memory for the active series ((100 * increase_prometheus(dumbmonit_victoriametrics_slow_inserts_total[15m]) / increase_prometheus(dumbmonit_victoriametrics_rows_added_total[15m])) and on (target) dumbmonit_victoriametrics_uptime_seconds > 900); clears below 3 %. Only judged once the server has run for 15 minutes, so a restart (cold cache, counters back to zero inside the window) does not leave it pending.	> 5 %	30 min	Advisory (warning)	24 h
Loki not ready	/ready does not answer ready (dumbmonit_loki_ready).	< 1	5 min	Warning (critical)	6 h
Loki refusing log lines	Lines refused in the last hour: too old, rate or stream limit, line too long (increase_prometheus(dumbmonit_loki_discarded_lines_total[1h])).	> 0	15 min	Advisory (warning)	24 h
Loki cannot flush to storage	Chunks failed to reach storage in the last 30 minutes; they are lost if Loki restarts (increase_prometheus(dumbmonit_loki_flush_failures_total[30m])).	> 0	10 min	Warning (critical)	1 h
Loki write-ahead log disk full	WAL writes lost to a full disk (increase_prometheus(dumbmonit_loki_wal_disk_full_failures_total[30m])).	> 0	5 min	Warning (critical)	1 h
Loki request errors	More than five requests answered with a server error in 15 minutes (increase_prometheus(dumbmonit_loki_request_errors_total[15m])).	> 5	15 min	Advisory (warning)	6 h
Graylog not processing	Message processing paused on the node (dumbmonit_graylog_processing).	< 1	5 min	Warning (critical)	6 h
Graylog search cluster down	OpenSearch or Elasticsearch red, or unreachable from Graylog (dumbmonit_graylog_indexer_status: 2 red, 3 unreachable).	≥ 2	5 min	Warning (critical)	1 h
Graylog search cluster yellow	Replica shards unassigned for half an hour (dumbmonit_graylog_indexer_status == 1).	> 0	30 min	Advisory (warning)	24 h
Graylog journal filling	The journal is more than half full: the output does not keep up (dumbmonit_graylog_journal_used_percent); clears below 40 %.	> 50 %	10 min	Advisory (warning), escalates after 1 h	6 h
Graylog input failed	An input failed to start (dumbmonit_graylog_inputs_failed).	> 0	5 min	Advisory (warning)	24 h
Graylog indexing failures	Writes to the search cluster or message processing failed in the last hour (increase_prometheus(dumbmonit_graylog_output_failures_total[1h]) + increase_prometheus(dumbmonit_graylog_processing_failures_total[1h])).	> 0	15 min	Advisory (warning)	24 h

Self-hosted applications

Nextcloud, Immich, Paperless-ngx, Jellyfin and Plex (monitors). They rarely fall over outright: the page opens while syncing, thumbnails, imports or library scans have stopped. These rules watch those states; an application that does not answer at all is Monitor unreachable.

Rule	What	Default threshold	Hold	Severity	Reminder
Nextcloud stuck in maintenance	Maintenance mode is on (dumbmonit_nextcloud_maintenance): nobody can log in or sync.	> 0	30 min	Advisory (warning), escalates after 3 h	6 h
Nextcloud database upgrade pending	The code was updated and Nextcloud waits for occ upgrade (dumbmonit_nextcloud_needs_db_upgrade).	> 0	10 min	Warning (critical)	1 h
Nextcloud update available	Nextcloud’s update check found a newer release (dumbmonit_nextcloud_update_available).	> 0	1 h	Info (info)	7 d
Nextcloud OPcache full	PHP’s OPcache is out of room and pages get slow (dumbmonit_nextcloud_opcache_full).	> 0	30 min	Advisory (warning)	24 h
Nextcloud free space low	Less than 5 GiB free for the data directory (dumbmonit_nextcloud_free_space_bytes / 1073741824); clears above 6 GiB.	< 5 GiB	30 min	Advisory (warning)	24 h
Immich jobs stalled	Jobs wait in a queue that is not paused and runs nothing (dumbmonit_immich_queue_waiting > 0 and on (target, queue) dumbmonit_immich_queue_active == 0 unless on (target, queue) dumbmonit_immich_queue_paused == 1). The notification names the queue.	> 0	1 h	Advisory (warning)	6 h
Immich queue paused	A job queue has been paused for a day (dumbmonit_immich_queue_paused).	> 0	24 h	Info (info)	7 d
Immich storage almost full	The disk holding the library is more than 90 % full (dumbmonit_immich_storage_used_percent); clears below 88 %.	> 90 %	30 min	Advisory (warning)	24 h
Immich update available	Immich’s version check knows a newer release (dumbmonit_immich_update_available).	> 0	1 h	Info (info)	7 d
Immich jobs failing	A queue other than machine learning holds 25 or more failed jobs (dumbmonit_immich_queue_failed). The notification names the queue.	≥ 25	30 min	Advisory (warning)	24 h
Immich machine learning failing	The smart search, faces, duplicates and text recognition queues hold 10 or more failed jobs: the machine learning container is probably down (dumbmonit_immich_queue_failed).	≥ 10	30 min	Advisory (warning)	24 h
Immich in maintenance mode	Immich has stayed in maintenance mode (dumbmonit_immich_maintenance_mode).	> 0	30 min	Advisory (warning)	6 h
Immich user quota almost full	An account with a quota used more than 90 % of it (dumbmonit_immich_user_quota_used_percent); clears below 85 %.	> 90 %	1 h	Advisory (warning)	24 h
Immich database backup stale	The newest database backup is more than three days old (dumbmonit_immich_db_backup_last_age_seconds); needs databaseBackup.list.	> 3 d	1 h	Advisory (warning)	24 h
Paperless task queue down	Redis or Celery in error (max by (target) (dumbmonit_paperless_component_status{component=~"redis|celery"}): 2 is an error): nothing new is imported.	≥ 2	5 min	Warning (critical)	1 h
Paperless index or sanity check error	The search index, the classifier or the sanity check (missing or altered files) reports an error (dumbmonit_paperless_component_status{component=~"index|classifier|sanity_check"}).	≥ 2	30 min	Advisory (warning)	24 h
Paperless migrations pending	Database migrations left to apply (dumbmonit_paperless_unapplied_migrations).	> 0	30 min	Advisory (warning)	24 h
Paperless task failed	A task this user can see failed within the failed task window and was not dismissed (dumbmonit_paperless_tasks_failed_recent).	> 0	5 min	Advisory (warning)	24 h
Paperless storage almost full	The disk holding the documents is more than 90 % full (dumbmonit_paperless_storage_used_percent); clears below 88 %.	> 90 %	30 min	Advisory (warning)	24 h
Paperless update available	Paperless-ngx’s version check knows a newer release (dumbmonit_paperless_update_available).	> 0	1 h	Info (info)	7 d
Jellyfin scheduled task failed	A scheduled task (a library scan, a cleanup) failed or was aborted on its last run (dumbmonit_jellyfin_scheduled_tasks_failed).	> 0	10 min	Advisory (warning)	24 h
Jellyfin plugin broken	A plugin failed to load or does not support this version (dumbmonit_jellyfin_plugins_broken).	> 0	15 min	Advisory (warning)	24 h
Jellyfin restart pending	Jellyfin has waited a day for a restart after a plugin install or update (dumbmonit_jellyfin_pending_restart).	> 0	24 h	Info (info)	7 d
Jellyfin library scan stale	The scheduled library scan has not finished for three days (dumbmonit_jellyfin_library_scan_age_seconds, only while the scan has a periodic trigger).	> 3 d	30 min	Advisory (warning)	24 h
Jellyfin storage almost full	A disk used by Jellyfin (library, data, cache, transcodes) is more than 90 % full (dumbmonit_jellyfin_storage_used_percent); clears below 88 %.	> 90 %	30 min	Advisory (warning)	24 h
Jellyfin heavy CPU transcoding	Three or more streams transcoded without hardware acceleration (dumbmonit_jellyfin_transcodes_software).	≥ 3	15 min	Info (info)	12 h
Jellyfin failed sign-ins	Ten or more failed sign-ins in the last hour (dumbmonit_jellyfin_failed_logins_recent).	≥ 10	5 min	Advisory (warning)	6 h
Plex update available	Plex’s update check found a newer release (dumbmonit_plex_update_available).	> 0	1 h	Info (info)	7 d
Plex transcoder too slow	The slowest video transcode being played runs below real time (dumbmonit_plex_transcode_speed_min): playback will buffer.	< 0.95	10 min	Advisory (warning)	6 h
Plex transcode error	A transcode session reports an error (dumbmonit_plex_transcode_errors).	> 0	5 min	Advisory (warning)	12 h
Plex remote access failed	Plex reports its remote access (port mapping) failed (dumbmonit_plex_remote_access_failed).	> 0	30 min	Advisory (warning)	24 h
Plex signed out of plex.tv	A claimed server lost its plex.tv sign-in (dumbmonit_plex_signin_ok).	< 1	1 h	Advisory (warning)	24 h
Plex database backup off	The “Backup database” maintenance task is turned off (dumbmonit_plex_database_backup_enabled); ignore it if another backup covers the database.	< 1	24 h	Info (info)	30 d

Self-hosted forges

GitLab (self-managed) and Forgejo/Gitea (monitors). An instance that answers nothing at all is Monitor unreachable; these rules watch the parts that keep serving pages while quietly falling behind — Sidekiq, CI/CD runners, a scheduled task that stopped running.

Rule	What	Default threshold	Hold	Severity	Reminder
GitLab runners all offline	Every CI/CD runner GitLab knows is offline, and at least one is registered (dumbmonit_gitlab_runners_online and on (target) dumbmonit_gitlab_runners_total > 0).	< 1	10 min	Advisory (warning)	6 h
GitLab Sidekiq backlog high	A Sidekiq queue has more than 500 jobs waiting (max by (target) (dumbmonit_gitlab_sidekiq_queue_backlog)): notifications, webhooks and imports fall behind.	> 500	15 min	Advisory (warning)	6 h
GitLab migrations pending	Database migrations from an upgrade are left to apply (dumbmonit_gitlab_migrations_pending).	> 0	1 h	Info (info)	24 h
GitLab license expiring	The Enterprise Edition licence expires in less than 30 days (dumbmonit_gitlab_license_expiry_seconds).	< 30 d	1 h	Advisory (warning)	24 h
Forgejo/Gitea runners all offline	Every Actions runner is offline, and at least one is registered (dumbmonit_forgejo_runners_online and on (target) dumbmonit_forgejo_runners_total > 0).	< 1	10 min	Advisory (warning)	6 h
Forgejo/Gitea scheduled task overdue	A scheduled task (repository check, cleanup, update checker) did not run at its own interval (dumbmonit_forgejo_cron_task_overdue).	> 0	30 min	Advisory (warning)	24 h

Media, identity and mail applications

Sonarr, Radarr, Lidarr, Prowlarr, qBittorrent, UniFi Protect, Frigate, Keycloak, authentik, Vaultwarden and mailcow (monitors). These keep answering while the service they provide is broken: a download client down, a camera dropped, a database gone behind a login page. An application that does not answer at all is Monitor unreachable.

Rule	What	Default threshold	Hold	Severity	Reminder
Sonarr health error	Sonarr reports an error on its System → Status page: a failing download client or indexer, a missing root folder (dumbmonit_sonarr_health_errors).	> 0	15 min	Advisory (warning)	6 h
Sonarr queue has errors	An item of the download queue has an error (failed download, import blocked) for half an hour (dumbmonit_sonarr_queue_has_errors).	> 0	30 min	Advisory (warning)	6 h
Sonarr disk almost full	A disk Sonarr reports is more than 90 % full (dumbmonit_sonarr_disk_used_percent); clears below 88 %.	> 90 %	30 min	Advisory (warning)	24 h
Sonarr update available	A newer Sonarr release exists (dumbmonit_sonarr_update_available).	> 0	1 h	Info (info)	7 d
Radarr health error	Radarr reports an error on its System → Status page: a failing download client or indexer, a missing root folder (dumbmonit_radarr_health_errors).	> 0	15 min	Advisory (warning)	6 h
Radarr queue has errors	An item of the download queue has an error (failed download, import blocked) for half an hour (dumbmonit_radarr_queue_has_errors).	> 0	30 min	Advisory (warning)	6 h
Radarr disk almost full	A disk Radarr reports is more than 90 % full (dumbmonit_radarr_disk_used_percent); clears below 88 %.	> 90 %	30 min	Advisory (warning)	24 h
Radarr update available	A newer Radarr release exists (dumbmonit_radarr_update_available).	> 0	1 h	Info (info)	7 d
Lidarr health error	Lidarr reports an error on its System → Status page: a failing download client or indexer, a missing root folder (dumbmonit_lidarr_health_errors).	> 0	15 min	Advisory (warning)	6 h
Lidarr queue has errors	An item of the download queue has an error (failed download, import blocked) for half an hour (dumbmonit_lidarr_queue_has_errors).	> 0	30 min	Advisory (warning)	6 h
Lidarr disk almost full	A disk Lidarr reports is more than 90 % full (dumbmonit_lidarr_disk_used_percent); clears below 88 %.	> 90 %	30 min	Advisory (warning)	24 h
Lidarr update available	A newer Lidarr release exists (dumbmonit_lidarr_update_available).	> 0	1 h	Info (info)	7 d
Prowlarr health error	Prowlarr reports an error on its System → Status page: a failing download client or indexer, a missing root folder (dumbmonit_prowlarr_health_errors).	> 0	15 min	Advisory (warning)	6 h
Prowlarr disk almost full	A disk Prowlarr reports is more than 90 % full (dumbmonit_prowlarr_disk_used_percent); clears below 88 %.	> 90 %	30 min	Advisory (warning)	24 h
Prowlarr update available	A newer Prowlarr release exists (dumbmonit_prowlarr_update_available).	> 0	1 h	Info (info)	7 d
Prowlarr indexers disabled	Prowlarr disabled indexers after repeated failures (dumbmonit_prowlarr_indexers_disabled): Sonarr, Radarr and Lidarr stop finding releases through them.	> 0	1 h	Advisory (warning)	24 h
qBittorrent torrents in error	Torrents are in error or have lost their files (dumbmonit_qbittorrent_torrents_errored).	> 0	15 min	Advisory (warning)	24 h
qBittorrent disconnected	qBittorrent is firewalled or disconnected (dumbmonit_qbittorrent_connected == bool 0): nothing is downloaded or seeded.	> 0	15 min	Advisory (warning)	6 h
qBittorrent free space low	Less than 5 GiB free in the download folder (dumbmonit_qbittorrent_free_space_bytes / 1073741824); clears above 6 GiB.	< 5 GiB	30 min	Advisory (warning)	24 h
Protect camera offline	A UniFi Protect camera is disconnected from its NVR (dumbmonit_unifiprotect_camera_online == bool 0). The notification names the camera.	> 0	5 min	Advisory (warning)	6 h
Protect camera not recording	A camera is connected and set to record but does not (dumbmonit_unifiprotect_cameras_not_recording).	> 0	15 min	Advisory (warning)	6 h
Protect NVR disk unhealthy	The NVR reports a failing disk (dumbmonit_unifiprotect_disks_unhealthy).	> 0	5 min	Warning (critical)	1 h
Protect recording disabled	Recording is switched off on the NVR (dumbmonit_unifiprotect_recording_disabled).	> 0	10 min	Advisory (warning)	6 h
Frigate camera offline	A camera delivers no frames to Frigate (dumbmonit_frigate_camera_online == bool 0). The notification names the camera.	> 0	5 min	Advisory (warning)	6 h
Frigate detector stuck	A detector has been on the same inference for more than 30 seconds (dumbmonit_frigate_detector_busy_seconds).	> 30 s	2 min	Advisory (warning)	1 h
Frigate storage almost full	The disk holding the recordings is more than 90 % full (dumbmonit_frigate_storage_used_percent); clears below 88 %.	> 90 %	30 min	Advisory (warning)	24 h
Frigate update available	A newer Frigate release exists (dumbmonit_frigate_update_available).	> 0	1 h	Info (info)	7 d
Keycloak not ready	Keycloak answers but its readiness check is DOWN, usually the database (dumbmonit_keycloak_ready == bool 0): nobody can log in.	> 0	5 min	Warning (critical)	1 h
Keycloak realm disabled	A realm is disabled (dumbmonit_keycloak_realms_disabled): its users cannot log in.	> 0	1 h	Info (info)	7 d
authentik not ready	authentik answers but its readiness check fails (dumbmonit_authentik_ready == bool 0): database or cache down.	> 0	5 min	Warning (critical)	1 h
authentik has no worker	No worker reports (dumbmonit_authentik_workers == bool 0): synchronisation, e-mails and clean-up stop.	> 0	10 min	Warning (critical)	1 h
authentik task failed	A system task failed on its last run (dumbmonit_authentik_tasks_failed). The notification names the task.	> 0	1 h	Advisory (warning)	24 h
authentik outpost disconnected	An outpost that serves providers has not reported for five minutes (dumbmonit_authentik_outposts_disconnected).	> 0	10 min	Advisory (warning)	6 h
authentik update available	A newer authentik release exists (dumbmonit_authentik_update_available).	> 0	1 h	Info (info)	7 d
Vaultwarden sign-ups open	Anyone who can reach the vault can create an account (dumbmonit_vaultwarden_signups_open).	> 0	1 h	Info (info)	7 d
mailcow container down	A mailcow container is not running (dumbmonit_mailcow_container_up == bool 0). The notification names the container.	> 0	5 min	Warning (critical)	1 h
mailcow mail queue stuck	The oldest message in Postfix’s queue has waited more than four hours (dumbmonit_mailcow_queue_oldest_seconds / 3600).	> 4 h	15 min	Advisory (warning)	6 h
mailcow mail volume almost full	The volume holding the mailboxes is more than 90 % full (dumbmonit_mailcow_vmail_used_percent); clears below 88 %.	> 90 %	30 min	Advisory (warning)	24 h
mailcow mailbox near quota	A mailbox is at 90 % of its quota or more (dumbmonit_mailcow_mailboxes_near_quota).	> 0	1 h	Info (info)	24 h

Client devices

One rule, shared by every integration that tracks client devices connecting and backing up — Immich’s phones, tablets and desktops (monitors), Proxmox Backup Server’s backed-up machines, one per backup group (monitors), and Veeam’s protected computers and VMs, one per object with a restore point (monitors), today; more to follow. Each integration computes the gap to its own target’s staleness window (device_stale_days, 3 days by default) and publishes it as dumbmonit_client_device_stale_seconds, labelled device, type, os, user, kind and signal (connection or backup); this one rule then fires for any of them, naming the monitor in the notification. Synology Active Backup for Business tracks its own monitors separately, through a rhythm-aware mechanism (synology_abb_device_*) rather than this generic family — see Synology.

Rule	What	Default threshold	Hold	Severity	Reminder
Client device stale	A device has not connected or not backed up within the staleness window configured for this target (dumbmonit_client_device_stale_seconds).	> 0	1 h	Advisory (warning)	24 h

Pi-hole

Pi-hole v6, read through its REST API.

Rule	What	Default threshold	Hold	Severity	Reminder
Pi-hole blocking disabled	Blocking is off, paused or failed (dumbmonit_pihole_blocking_enabled). The hold lets a five-minute pause from the web interface go by.	< 1	15 min	Advisory (warning)	6 h
Pi-hole blocklists stale	The blocklists (gravity) have not been rebuilt for more than eight days (dumbmonit_pihole_gravity_age_seconds): the weekly update fails.	> 8 d	1 h	Advisory (warning)	24 h
Pi-hole update available	A newer version is available (dumbmonit_pihole_updates_available): the image in Docker, core, web interface or FTL otherwise. Pi-hole checks once a day.	> 0	1 h	Info (info)	7 d
Pi-hole diagnosis messages	Pi-hole lists messages on its diagnosis page (dumbmonit_pihole_messages): a blocklist that failed to download, a rate-limited client, an overloaded host.	> 0	15 min	Info (info)	24 h
Pi-hole SERVFAIL replies	More than 5% of the DNS replies of the last 24 hours are SERVFAIL (100 * dumbmonit_pihole_replies_servfail_24h / dumbmonit_pihole_queries_24h), once at least 200 queries were answered: an upstream resolver is failing.	> 5 %	30 min	Advisory (warning)	6 h
Pi-hole upstream resolver slow	An upstream resolver answers in more than a second on average (dumbmonit_pihole_upstream_response_seconds, one series per resolver that was asked).	> 1 s	30 min	Advisory (warning)	6 h
Pi-hole blocklist download failing	At least one enabled blocklist failed to download on the last gravity update (dumbmonit_pihole_lists_download_failed): it is stale or empty.	> 0	1 h	Advisory (warning)	24 h
Pi-hole receives no queries	No DNS query in the last 24 hours (dumbmonit_pihole_queries_24h): no client uses it any more, or FTL is stuck.	< 1	1 h	Info (info)	24 h

AdGuard Home

The DNS filter (monitor). Query and block figures are sums over AdGuard Home’s own statistics window, not counters: no rule is built on them.

Rule	What	Default threshold	Hold	Severity	Reminder
AdGuard Home protection off	Protection disabled, or paused and not back yet (dumbmonit_adguard_protection_enabled).	< 1	15 min	Advisory (warning)	6 h
AdGuard Home DNS not running	The web interface answers but the DNS server is stopped (dumbmonit_adguard_running).	< 1	5 min	Warning (critical)	1 h
AdGuard Home upstream failing	An upstream DNS server fails AdGuard Home’s own test, or stays silent 4 seconds (dumbmonit_adguard_upstream_up, one series per upstream).	< 1	10 min	Advisory (warning)	6 h
AdGuard Home filter lists stale	The oldest update of an enabled filter list is more than three days old (dumbmonit_adguard_filter_oldest_update_age_seconds).	> 3 days	1 h	Advisory (warning)	24 h
AdGuard Home update available	A newer version is announced by AdGuard Home’s own version check (dumbmonit_adguard_update_available); never fires when that check is disabled, as in the official Docker image.	> 0	1 h	Info (info)	7 days
AdGuard Home slow to answer	The average time to process a DNS query is above half a second (dumbmonit_adguard_avg_processing_seconds): the host is overloaded or an upstream is slow.	> 0.5 s	30 min	Advisory (warning)	6 h
AdGuard Home upstream slow	An upstream answers in more than a second on average over the statistics window (dumbmonit_adguard_upstream_avg_seconds, one series per upstream).	> 1 s	30 min	Advisory (warning)	6 h
AdGuard Home certificate invalid	The certificate or private key of the encrypted DNS does not load or does not match (dumbmonit_adguard_tls_valid); only when encryption is on.	< 1	10 min	Advisory (warning)	12 h
AdGuard Home certificate expiring	The certificate of the encrypted DNS expires in less than 14 days (dumbmonit_adguard_tls_expiry_seconds).	< 14 d	1 h	Advisory (warning)	24 h
AdGuard Home DHCP range almost full	More than 90% of the DHCP address range is leased (dumbmonit_adguard_dhcp_pool_used_percent); only when the DHCP server is on.	> 90 %	30 min	Advisory (warning)	12 h
AdGuard Home receives no queries	No query over the whole statistics window, when statistics are on and cover at least a day (dumbmonit_adguard_dns_queries).	< 1	1 h	Info (info)	24 h

UPS behind NUT

UPS read from a NUT server. Every series carries the ups label, so an alert names the UPS when one server publishes several. The status flags are 0 or 1 at every read, so a rule clears by itself once mains power is back. UPS read over SNMP are covered by the UPS rules above.

Rule	What	Default threshold	Hold	Severity	Reminder
UPS on battery (NUT)	The UPS is powering the load from battery (dumbmonit_nut_ups_on_battery, the OB flag of ups.status).	> 0	30 s	Warning (critical)	15 min
UPS battery low (NUT)	The UPS reports a low battery, the LB flag (dumbmonit_nut_ups_low_battery): the machines it powers are about to shut down.	> 0	1 min	Warning (critical)	30 min
UPS battery needs replacing (NUT)	The UPS asks for its battery to be replaced, the RB flag (dumbmonit_nut_ups_replace_battery).	> 0	1 h	Advisory (warning)	7 d
UPS load high (NUT)	The load has stayed above 80 % (dumbmonit_nut_ups_load_percent); clears below 75 %.	> 80 %	10 min	Advisory (warning)	24 h
UPS runtime short (NUT)	The UPS estimates less than five minutes of runtime on battery (dumbmonit_nut_battery_runtime_seconds); clears above six. On mains power, a worn battery or a UPS too small for its load.	< 300 s	5 min	Advisory (warning)	24 h
UPS data stale (NUT)	The NUT server answers but has no fresh data from the UPS: cable, driver or UPS silent (dumbmonit_nut_ups_data_stale). An outage would go unseen meanwhile.	> 0	5 min	Advisory (warning), escalates after 1 h	6 h

MikroTik RouterOS

Series carry the interface or sensor label, so a notification names the port or the sensor (monitor). Counters go through increase_prometheus: a router added with years of errors behind it does not fire on its first measurement.

Rule	What	Default threshold	Hold	Severity	Reminder
MikroTik CPU high	The router’s CPU has stayed above 90 % (dumbmonit_mikrotik_cpu_load_percent): routing, the firewall or a script is saturating it. Clears below 80 %.	> 90 %	15 min	Advisory (warning)	6 h
MikroTik memory high	More than 90 % of the memory is in use (dumbmonit_mikrotik_memory_used_percent). Clears below 85 %.	> 90 %	15 min	Advisory (warning)	6 h
MikroTik storage almost full	The flash storage is more than 90 % full (dumbmonit_mikrotik_storage_used_percent): configuration changes and upgrades may fail. Clears below 85 %.	> 90 %	30 min	Advisory (warning)	24 h
MikroTik temperature high	A temperature sensor reads above 80 °C (dumbmonit_mikrotik_temperature_celsius). Clears at 75 °C.	> 80 °C	10 min	Advisory (warning)	6 h
MikroTik power supply or fan failed	A psu*-state or fan*-state sensor is not ok (dumbmonit_mikrotik_health_ok). A redundant power supply that died cuts nothing, until the second one does.	< 1	5 min	Warning (critical)	1 h
MikroTik interface accumulating errors	More than fifty receive and transmit errors on an interface in the last hour (increase_prometheus(dumbmonit_mikrotik_interface_rx_errors_total[1h]) + increase_prometheus(dumbmonit_mikrotik_interface_tx_errors_total[1h])).	> 50	15 min	Advisory (warning)	24 h
MikroTik link flapping	An interface lost its link more than twice in thirty minutes (increase_prometheus(dumbmonit_mikrotik_interface_link_downs_total[30m])). A port unplugged for good counts once and does not fire.	> 2	5 min	Advisory (warning)	1 h
MikroTik RouterOS update available	A newer RouterOS is available on the router’s update channel (dumbmonit_mikrotik_update_available). Only known when the router checks for updates itself: see the optional step of the setup.	> 0	1 h	Info (info)	7 d
MikroTik firmware upgrade pending	RouterBOOT is older than the firmware bundled with the installed RouterOS (dumbmonit_mikrotik_firmware_upgrade_pending); it is upgraded only on request, then at the next reboot.	> 0	1 h	Info (info)	7 d

UniFi Network

Monitor page. Device series carry the device’s name, model and type, so the notification says “Living room AP”. A device waiting for adoption has no device_up series and never counts as offline.

Rule	What	Default threshold	Hold	Severity	Reminder
UniFi device offline	A UniFi device adopted by the controller is offline, isolated or failed to adopt (dumbmonit_unifi_device_up).	< 1	5 min	Advisory (warning), escalates after 1 h	6 h
UniFi Internet down	The UniFi gateway reports no Internet connection (dumbmonit_unifi_internet_up). Without a UniFi gateway the series does not exist and the rule stays silent.	< 1	3 min	Warning (critical)	1 h
UniFi WAN link down	A WAN link of the UniFi gateway is down (dumbmonit_unifi_wan_link_up): with two links, redundancy is lost while nothing seems broken. A disabled port has no series.	< 1	5 min	Advisory (warning)	6 h
UniFi gateway CPU high	The UniFi gateway’s processor has been above 90% for fifteen minutes (dumbmonit_unifi_device_cpu_percent{type="gateway"}); clears below 80 %.	> 90 %	15 min	Advisory (warning)	6 h
UniFi device waiting for adoption	A device appeared on the network and waits to be adopted in UniFi (dumbmonit_unifi_devices{state="pending"}).	> 0	30 min	Info (info)	24 h
UniFi firmware update available	A firmware update is available for UniFi devices (dumbmonit_unifi_devices_upgradable).	> 0	1 h	Info (info)	7 d
UniFi alarms	UniFi logged critical events or raised alarms in the last 24 hours (dumbmonit_unifi_alarms). Only read with a View Only account.	> 0	5 min	Advisory (warning)	24 h

Home Assistant

Monitor page.

Rule	What	Default threshold	Hold	Severity	Reminder
Home Assistant in recovery mode	Home Assistant started in recovery mode: its configuration could not be loaded and automations do not run (dumbmonit_homeassistant_recovery_mode).	> 0	2 min	Warning (critical)	1 h
Home Assistant not running	Home Assistant answers but has not finished starting for ten minutes (dumbmonit_homeassistant_running).	< 1	10 min	Advisory (warning)	6 h
Home Assistant entities went unavailable	At least five more entities are unavailable than an hour ago: an integration, a hub or a radio stopped (sum by (target) (dumbmonit_homeassistant_entities_unavailable) - sum by (target) (dumbmonit_homeassistant_entities_unavailable offset 1h)). The rise counts, not the total, which a real installation never has at zero.	≥ 5	10 min	Advisory (warning)	6 h
Home Assistant battery low	A battery reported by Home Assistant is low (dumbmonit_homeassistant_battery_low, one series per battery below the device’s threshold, 20% by default; its value is the level).	≥ 0 %	30 min	Info (info)	3 d
Home Assistant update available	Home Assistant has updates waiting: core, operating system, add-ons or device firmware (dumbmonit_homeassistant_updates_available).	> 0	1 h	Info (info)	7 d
Home Assistant repair to address	Home Assistant has an open repair of error or critical severity (dumbmonit_homeassistant_repair{severity=~"error|critical"}).	> 0	15 min	Advisory (warning)	24 h
Home Assistant safety sensor triggered	A smoke, gas, carbon monoxide, water leak or safety sensor is on (dumbmonit_homeassistant_safety_alert, one series per sensor).	> 0	1 min	Warning (critical)	30 min
Home Assistant alarm triggered	An alarm panel is in the triggered state (dumbmonit_homeassistant_alarm_triggered).	> 0	30 s	Warning (critical)	30 min
Home Assistant problem sensor on	A binary sensor of class problem or tamper has been on for thirty minutes (dumbmonit_homeassistant_problem).	> 0	30 min	Advisory (warning)	12 h
Home Assistant automation unavailable	An automation is unavailable: its configuration no longer loads, so it never runs (dumbmonit_homeassistant_entities_unavailable{domain="automation"}).	> 0	30 min	Advisory (warning)	24 h

VMware vSphere

Monitor page. Host series carry esxi, VM series vm, datastore series datastore, so the notification names the object.

Rule	What	Default threshold	Hold	Severity	Reminder
vSphere host not responding	A vSphere host is not responding to vCenter (dumbmonit_vsphere_host_connection_state: 2 not responding). A host disconnected on purpose (1) does not fire.	≥ 2	3 min	Warning (critical)	1 h
vSphere host health red	vSphere reports a host’s overall health as red (dumbmonit_vsphere_host_status == 2). Gray means unknown and does not fire.	> 0	5 min	Warning (critical)	1 h
vSphere host left in maintenance	A vSphere host has been in maintenance mode for a day: its VMs were moved away and it may have been forgotten there (dumbmonit_vsphere_host_maintenance).	> 0	24 h	Info (info)	24 h
vSphere datastore almost full	A vSphere datastore is 90% full or more (dumbmonit_vsphere_datastore_used_percent); clears below 85 %.	≥ 90 %	15 min	Advisory (warning), escalates after 24 h	6 h
vSphere datastore inaccessible	A vSphere datastore is inaccessible: the VMs stored on it cannot run (dumbmonit_vsphere_datastore_accessible).	< 1	5 min	Warning (critical)	1 h
vSphere VM tools not running	VMware Tools are installed but not running in a powered-on VM: the guest may be hung (dumbmonit_vsphere_vm_tools_status == 2). VMs without Tools do not fire.	> 0	30 min	Info (info)	24 h
vSphere red alarm	vSphere raised a red alarm that nobody acknowledged (dumbmonit_vsphere_alarm{status="red"}, one series per alarm, named after the alarm and the object).	> 0	5 min	Advisory (warning)	6 h

Databases, message broker and security engine

Redis / Valkey, MongoDB, RabbitMQ and CrowdSec (Redis, MongoDB, RabbitMQ, CrowdSec). Counters go through increase_prometheus or changes_prometheus, so nothing fires on a monitor’s first measurement.

Rule	What	Default threshold	Hold	Severity	Reminder
Redis memory near maxmemory	Memory used above 90 % of maxmemory (dumbmonit_redis_memory_used_percent); clears below 85 %. No series without maxmemory.	> 90 %	10 min	Advisory (warning)	6 h
Redis refusing connections	Client connections refused in the last 15 minutes: maxclients reached (increase_prometheus(dumbmonit_redis_rejected_connections_total[15m])).	> 0	5 min	Warning (critical)	1 h
Redis replication link down	A replica lost its link to the primary (dumbmonit_redis_master_link_up).	< 1	2 min	Warning (critical)	1 h
Redis replica lagging	Seen from the primary, a replica has not acknowledged for more than 30 seconds (dumbmonit_redis_replica_lag_seconds).	> 30 s	5 min	Advisory (warning)	6 h
Redis snapshot failed	The last BGSAVE failed; with stop-writes-on-bgsave-error, writes are refused (dumbmonit_redis_rdb_last_save_ok).	< 1	5 min	Warning (critical)	1 h
Redis append-only file write failed	The last AOF write failed (dumbmonit_redis_aof_last_write_ok).	< 1	5 min	Warning (critical)	1 h
MongoDB replica set without primary	No member is primary: no write is accepted (dumbmonit_mongodb_replset_primary_present).	< 1	2 min	Warning (critical)	1 h
MongoDB member unreachable	A replica set member is unreachable from the others (dumbmonit_mongodb_replset_member_health).	< 1	5 min	Warning (critical)	1 h
MongoDB replication lag	A secondary is more than a minute behind the primary (dumbmonit_mongodb_replset_member_lag_seconds); clears below 30 s.	> 60 s	10 min	Advisory (warning)	6 h
MongoDB connections near the limit	More than 80 % of the available connections in use (dumbmonit_mongodb_connections_used_percent); clears below 75 %.	> 80 %	10 min	Advisory (warning)	6 h
MongoDB cache under pressure	More than 20 % of the WiredTiger cache is dirty (dumbmonit_mongodb_wiredtiger_cache_dirty_percent); clears below 15 %.	> 20 %	10 min	Advisory (warning)	6 h
MongoDB internal errors	Regular assertions in the last hour (increase_prometheus(dumbmonit_mongodb_asserts_total{type="regular"}[1h])).	> 0	15 min	Advisory (warning)	24 h
RabbitMQ memory or disk alarm	A node raised a resource alarm: every publisher is blocked (dumbmonit_rabbitmq_alarm, one series per node and resource).	> 0	1 min	Warning (critical)	1 h
RabbitMQ node down	A cluster node is not running (dumbmonit_rabbitmq_node_running).	< 1	2 min	Warning (critical)	1 h
RabbitMQ network partition	A node sees a network partition (dumbmonit_rabbitmq_node_partitions).	> 0	2 min	Warning (critical)	1 h
RabbitMQ queue without consumer	A queue holds messages and has no consumer (dumbmonit_rabbitmq_queue_messages_ready and dumbmonit_rabbitmq_queue_consumers == 0); the value is the number of messages waiting.	> 0	15 min	Advisory (warning)	6 h
RabbitMQ queue unavailable	A queue is not running: quorum queue without majority, or its node is down (dumbmonit_rabbitmq_queue_running).	< 1	5 min	Advisory (warning)	6 h
CrowdSec Local API down	The Local API does not answer /health (dumbmonit_crowdsec_lapi_up).	< 1	5 min	Warning (critical)	1 h
CrowdSec bouncer stopped pulling	A bouncer’s requests did not change in 30 minutes (changes_prometheus(dumbmonit_crowdsec_bouncer_requests_total[30m])).	< 1	5 min	Advisory (warning)	6 h
CrowdSec reads no logs	Not a single log line read in six hours (increase_prometheus(dumbmonit_crowdsec_lines_read_total[6h])).	< 1	30 min	Advisory (warning)	24 h

More databases and Kafka

SQL Server, Oracle, Elasticsearch / OpenSearch, InfluxDB and Kafka (SQL Server, Oracle, Elasticsearch, InfluxDB, Kafka). Counters go through increase_prometheus, so nothing fires on a monitor’s first measurement.

Rule	What	Default threshold	Hold	Severity	Reminder
SQL Server database unavailable	A database is SUSPECT, RECOVERY_PENDING, OFFLINE or EMERGENCY (dumbmonit_mssql_database_online).	< 1	5 min	Warning (critical)	1 h
SQL Server blocked requests	A request has been waiting on a lock for more than 5 minutes: a transaction was probably left open (dumbmonit_mssql_longest_block_seconds).	> 300 s	5 min	Advisory (warning)	6 h
SQL Server volume almost full	A volume holding database files is more than 90 % full; clears below 85 % (dumbmonit_mssql_volume_used_percent).	> 90 %	15 min	Advisory (warning)	6 h
SQL Server Agent job failed	The last run of an enabled SQL Server Agent job failed (backups, maintenance) (dumbmonit_mssql_agent_job_last_ok).	< 1	5 min	Advisory (warning)	24 h
SQL Server AlwaysOn replica unhealthy	A database replica of an availability group is not synchronizing in good health (dumbmonit_mssql_alwayson_sync_health).	< 2	10 min	Warning (critical)	1 h
SQL Server connections near the limit	User sessions use more than 90 % of the configured connection limit. No series without a limit (dumbmonit_mssql_sessions_used_percent).	> 90 %	10 min	Advisory (warning)	6 h
Oracle instance not open	The instance status is not OPEN (MOUNTED, STARTED…): the database serves nothing (dumbmonit_oracle_instance_open).	< 1	2 min	Warning (critical)	1 h
Oracle tablespace almost full	A tablespace is more than 90 % full of its maximum size; clears below 85 % (dumbmonit_oracle_tablespace_used_percent).	> 90 %	15 min	Advisory (warning)	6 h
Oracle sessions near the limit	Sessions use more than 90 % of the sessions parameter (ORA-00018 when it is reached) (dumbmonit_oracle_sessions_used_percent).	> 90 %	10 min	Advisory (warning)	6 h
Oracle Data Guard apply lag	A standby applies redo more than 10 minutes behind the primary (dumbmonit_oracle_dataguard_apply_lag_seconds).	> 600 s	10 min	Advisory (warning)	6 h
Oracle recovery area almost full	The fast recovery area is more than 90 % full: archiving can stall and freeze the database (dumbmonit_oracle_recovery_area_used_percent).	> 90 %	10 min	Warning (critical)	1 h
Oracle scheduler job failed	At least one scheduler job run failed in the last 24 hours (dumbmonit_oracle_scheduler_jobs_failed_24h).	> 0	15 min	Advisory (warning)	24 h
Elasticsearch cluster red	The cluster status is red: at least one primary shard is not allocated and part of the data is unavailable (dumbmonit_elasticsearch_cluster_status).	> 1	2 min	Warning (critical)	1 h
Elasticsearch cluster yellow	The cluster has been yellow for 30 minutes: replicas are missing and the next node failure will lose data (dumbmonit_elasticsearch_cluster_status == 1).	> 0	30 min	Advisory (warning)	6 h
Elasticsearch unassigned shards	Shards have stayed unassigned for 15 minutes (dumbmonit_elasticsearch_unassigned_shards).	> 0	15 min	Advisory (warning)	6 h
Elasticsearch node disk almost full	A node’s data disk is more than 85 % full (the high watermark is 90 %, the read-only flood stage 95 %); clears below 80 % (dumbmonit_elasticsearch_node_disk_used_percent).	> 85 %	10 min	Advisory (warning)	6 h
Elasticsearch JVM heap pressure	A node’s JVM heap stays above 90 % for 15 minutes: garbage collection will slow the node (dumbmonit_elasticsearch_node_heap_used_percent).	> 90 %	15 min	Advisory (warning)	6 h
InfluxDB unhealthy	InfluxDB answers its health check with a failure (dumbmonit_influxdb_healthy).	< 1	2 min	Warning (critical)	1 h
InfluxDB not ready	InfluxDB is up but does not report itself ready for queries and writes (dumbmonit_influxdb_ready).	< 1	5 min	Advisory (warning)	6 h
InfluxDB server errors	More than 10 API requests answered with a 5xx status in the last 15 minutes (increase_prometheus(dumbmonit_influxdb_http_requests_5xx_total[15m])).	> 10	5 min	Advisory (warning)	6 h
Kafka partitions offline	A partition has no leader: reads and writes to it fail (dumbmonit_kafka_offline_partitions).	> 0	2 min	Warning (critical)	1 h
Kafka under-replicated partitions	Partitions have fewer in-sync replicas than replicas for 10 minutes: a broker is down or lagging (dumbmonit_kafka_under_replicated_partitions).	> 0	10 min	Advisory (warning)	6 h
Kafka without controller	The cluster reports no controller: no leader election is possible (dumbmonit_kafka_controller_present).	< 1	2 min	Warning (critical)	1 h
Kafka consumer group lag	A consumer group is more than 10 000 messages behind for 15 minutes. Adjust the threshold to the traffic of your topics (dumbmonit_kafka_consumer_group_lag_total).	> 10000	15 min	Advisory (warning)	6 h

Reverse proxies and domains

Traefik, Caddy, Nginx Proxy Manager and domain registrations (Traefik, Caddy, Nginx Proxy Manager, Domain expiry), and the DNS check’s Alert when the answer changes option (Services). Series carry router, service, server, upstream, proxy_host or cert, so the notification names what failed.

Rule	What	Default threshold	Hold	Severity	Reminder
Traefik router disabled	A router is disabled by a configuration error (missing service or middleware, invalid rule): its sites are not served (dumbmonit_traefik_router_status: 0 enabled, 1 warning, 2 disabled).	≥ 2	5 min	Advisory (warning)	6 h
Traefik backend server down	A server of a load-balanced service fails its health check (dumbmonit_traefik_server_up).	< 1	5 min	Advisory (warning)	6 h
Traefik service without a server	No server of a service answers its health check: its sites get 503 (dumbmonit_traefik_service_servers_up).	< 1	2 min	Warning (critical)	1 h
Traefik certificate not obtained	Routers ask a certificate resolver for a certificate that no certificate held by Traefik covers yet: Traefik serves its default self-signed certificate (dumbmonit_traefik_resolver_routers_uncovered, needs Traefik’s /api/certificates).	> 0	1 h	Advisory (warning)	24 h
Caddy upstream unhealthy	A backend fails Caddy’s active or passive health check (dumbmonit_caddy_upstream_healthy).	< 1	5 min	Advisory (warning)	6 h
Caddy configuration reload failed	Caddy refused its last configuration reload and still runs the previous one (dumbmonit_caddy_config_last_reload_ok).	< 1	5 min	Advisory (warning)	24 h
Nginx Proxy Manager host offline	nginx refused an enabled host’s configuration: the host is not served (dumbmonit_npm_host_online).	< 1	10 min	Advisory (warning)	6 h
Proxy certificate not renewed	A certificate Traefik holds or a Nginx Proxy Manager host presents expires in less than 14 days: automatic renewal starts at 30, so it is failing (dumbmonit_traefik_cert_expiry_days or dumbmonit_npm_cert_expiry_days).	< 14 d	1 h	Advisory (warning)	24 h
Reverse proxy answering 5xx	More than 5 % of the answers over ten minutes were 5xx, with at least fifty requests (increase_prometheus of dumbmonit_{traefik,caddy}_requests_5xx_total over …_requests_total). Needs the proxy’s metrics.	> 5 %	10 min	Advisory (warning)	6 h
Domain expiring	The domain expires in less than 30 days (dumbmonit_domain_expiry_days >= 7).	< 30 d	1 h	Advisory (warning)	24 h
Domain about to expire	The domain expires in less than 7 days, or has expired (dumbmonit_domain_expiry_days).	< 7 d	1 h	Warning (critical)	12 h
Domain on hold	The registry put the domain in clientHold or serverHold: it is out of the DNS (dumbmonit_domain_on_hold).	> 0	30 min	Warning (critical)	6 h
Domain in redemption	The domain is in redemptionPeriod, pendingDelete or pendingRestore: it has expired (dumbmonit_domain_redemption).	> 0	30 min	Warning (critical)	12 h
Domain name servers changed	The name servers of the delegation differ from the previous reading (changes_prometheus(dumbmonit_domain_nameservers_fingerprint[1d])). Resolves by itself a day later.	> 0	1 min	Advisory (warning)	24 h
Domain registrar changed	The registrar differs from the previous reading: a transfer happened (changes_prometheus(dumbmonit_domain_registrar_fingerprint[1d])).	> 0	1 min	Advisory (warning)	24 h
Domain DNSSEC lost	DNSSEC was signed in the last 7 days and is not any more (dumbmonit_domain_dnssec).	< 1	1 h	Advisory (warning)	24 h
DNS answer changed	The answer of a DNS check with Alert when the answer changes differs from the one before (changes_prometheus(dumbmonit_probe_dns_answer_fingerprint[1h])). Resolves by itself an hour later.	> 0	1 min	Advisory (warning)	24 h

DNS blocklists

Mail server reputation and IP range blocklist. The lists are only asked every 6 hours; the last result is written again at every probe, hence the short hold. The monitor page links to the removal page of every listing.

Rule	What	Default threshold	Hold	Severity	Reminder
Listed on a major blocklist	An address or the domain is on Spamhaus (ZEN or DBL), Barracuda or SpamCop: a large share of its mail is refused (dumbmonit_blacklist_listed_major_lists).	> 0	5 min	Warning (critical)	24 h
Listed on a blocklist	An address or the domain is on a smaller list: Mailspike, UCEPROTECT, PSBL, SpamRATS, SURBL or URIBL (dumbmonit_blacklist_listed_lists - dumbmonit_blacklist_listed_major_lists).	> 0	5 min	Advisory (warning)	24 h
Mail server reverse DNS mismatch	An address of the mail server has no reverse DNS, or its name does not resolve back to it: Gmail, Outlook.com and Yahoo refuse or junk such mail (dumbmonit_blacklist_ptr_ok == bool 0).	> 0	5 min	Advisory (warning)	24 h
SPF or DMARC missing	The domain has no SPF record (or several), or no DMARC record: Gmail and Yahoo require both from bulk senders (dumbmonit_blacklist_mail_auth_missing).	> 0	5 min	Advisory (warning)	24 h

Website changes

See Website changes. The monitor page shows each change before and after.

Rule	What	Default threshold	Hold	Severity	Reminder
Website changed	A check of a watched page or site found pages that changed, appeared or disappeared (dumbmonit_webchange_last_check_changes). Each such check is notified and names the pages, under the same alert while it fires; it resolves at the first check that finds nothing new.	> 0	30 s	Info (info)	none

Network configuration backups

See Network configuration backup. The device page shows each version and the line diff, secrets masked.

Rule	What	Default threshold	Hold	Severity	Reminder
Network configuration changed	The last backup found a configuration different from the previous version, volatile lines (timestamps, counters) aside (dumbmonit_netconfig_config_changed). It resolves at the next backup that finds no change.	> 0	30 s	Info (info)	none
SSH host key changed	The device presented an SSH host key other than the remembered one: the connection was cut before any credential was sent, and backups stop until an administrator accepts the new key (dumbmonit_netconfig_host_key_changed).	> 0	none	Warning (critical)	6 h

Kubernetes

See Kubernetes / k3s. Every series is labelled with the node, or the namespace and the pod, workload or claim concerned.

Rule	What	Default threshold	Hold	Severity	Reminder
Kubernetes node not ready	A node is not Ready: its kubelet no longer reports, and its pods will be evicted (dumbmonit_k8s_node_ready == bool 0).	> 0	5 min	Warning (critical)	6 h
Kubernetes node under pressure	A node reports memory, disk or PID pressure (dumbmonit_k8s_node_pressure, label condition).	> 0	5 min	Advisory (warning)	6 h
Kubernetes pod crash looping	A container is in CrashLoopBackOff and still restarting: at least two restarts in 15 minutes (max_over_time(dumbmonit_k8s_pod_crashlooping[10m]) and on (target, namespace, pod) increase_prometheus(dumbmonit_k8s_pod_restarts[15m]) >= 2; the state disappears for a moment at each restart attempt). Containers killed by a node or runtime restart (exit 137, 143 or 255, not OOMKilled) do not count, so a reboot does not look like a crash loop.	> 0	10 min	Warning (critical)	6 h
Kubernetes pod stuck pending	A pod has been Pending for fifteen minutes: no node can take it, or a volume or an image it needs does not come (dumbmonit_k8s_pod_pending).	> 0	15 min	Advisory (warning)	6 h
Kubernetes pod restarting	A pod restarted more than five times in the last hour without being in CrashLoopBackOff (increase_prometheus(dumbmonit_k8s_pod_restarts[1h]) unless on (target, namespace, pod) max_over_time(dumbmonit_k8s_pod_crashlooping[10m]) > 0).	> 5	5 min	Advisory (warning)	6 h
Kubernetes workload missing replicas	A Deployment, StatefulSet or DaemonSet has fewer available replicas than it asks for (dumbmonit_k8s_workload_unavailable).	> 0	10 min	Advisory (warning), escalates after 1 h	6 h
Kubernetes volume claim pending	A PersistentVolumeClaim that a pod needs, or that a provisioning error concerns, is still not bound (dumbmonit_k8s_pvc_pending).	> 0	15 min	Advisory (warning)	6 h

Active Directory

See Active Directory. The domain controller DumbMonit queries is covered by Monitor unreachable; the other domain controllers of the domain by Domain controller unreachable (label dc).

Rule	What	Default threshold	Hold	Severity	Reminder
Domain controller unreachable	A domain controller of the domain no longer answers on its LDAP port (dumbmonit_ad_dc_reachable == bool 0). A name that does not resolve from DumbMonit produces no series and never fires.	> 0	5 min	Warning (critical)	6 h
Active Directory bind failed	The domain controller answers but refuses the service account: expired password, disabled or locked-out account (dumbmonit_ad_bind_ok == bool 0).	> 0	5 min	Advisory (warning)	24 h
Privileged group membership changed	A member joined or left Domain Admins, Enterprise Admins, Schema Admins, Administrators or an operators group, nesting included (changes_prometheus(dumbmonit_ad_privileged_group_fingerprint[1h]), label group). Resolves by itself an hour later.	> 0	1 min	Advisory (warning)	24 h
Active Directory replication failing	The queried domain controller cannot replicate from a partner (dumbmonit_ad_replication_consecutive_failures). Only when the account may read replication status.	> 0	30 min	Advisory (warning)	6 h
krbtgt password older than 180 days	The krbtgt password was last changed more than 180 days ago (dumbmonit_ad_krbtgt_password_age_seconds).	> 180 days	10 min	Info (info)	none

pfSense

See pfSense. Gateways are labelled gateway, interfaces interface and descr, services service.

Rule	What	Default threshold	Hold	Severity	Reminder
pfSense gateway down	A pfSense gateway is down: its monitor address no longer answers, and the traffic it carries stops or fails over (dumbmonit_pfsense_gateway_up).	< 1	3 min	Warning (critical)	6 h
pfSense gateway losing packets	A pfSense gateway loses more than 10 % of the probes to its monitor address: the line is degraded (dumbmonit_pfsense_gateway_loss_percent unless on (target, gateway) dumbmonit_pfsense_gateway_up == 0).	> 10 %	10 min	Advisory (warning)	6 h
pfSense gateway slow	The round trip to a pfSense gateway’s monitor address has stayed above 500 ms for fifteen minutes (dumbmonit_pfsense_gateway_delay_milliseconds).	> 500 ms	15 min	Advisory (warning)	6 h
pfSense interface without link	An enabled pfSense interface has no link: cable, switch port or network card (dumbmonit_pfsense_interface_down).	> 0	5 min	Advisory (warning)	6 h
pfSense service stopped	A pfSense service that is enabled is not running: DNS resolver, VPN, NTP… (dumbmonit_pfsense_service_stopped).	> 0	5 min	Advisory (warning)	6 h
pfSense disk nearly full	The pfSense disk is more than 90 % full: logs, reports and package updates stop being written (dumbmonit_pfsense_disk_used_percent).	> 90 %	30 min	Advisory (warning)	1 d

Unraid

See Unraid. Disks are labelled disk and role (parity, data, cache), containers container.

Rule	What	Default threshold	Hold	Severity	Reminder
Unraid array stopped	The Unraid array is not started: shares, containers and VMs that live on it are unavailable (dumbmonit_unraid_array_started).	< 1	10 min	Warning (critical)	6 h
Unraid disk disabled or missing	An Unraid disk is disabled, missing or invalid: the array runs degraded, and one more failure loses data (dumbmonit_unraid_disk_ok).	< 1	5 min	Warning (critical)	6 h
Unraid disk read errors	An Unraid disk has reported read errors since the array started: it may be disabled at the next one (dumbmonit_unraid_disk_errors).	> 0	5 min	Advisory (warning)	1 d
Unraid disk too hot	An Unraid array or parity disk has stayed above 55 °C for fifteen minutes (dumbmonit_unraid_disk_temperature_celsius{role=~"data|parity"}).	> 55 °C	15 min	Advisory (warning)	6 h
Unraid parity check found errors	The last Unraid parity check failed or found sync errors: parity no longer matches the data (dumbmonit_unraid_parity_check_ok).	< 1	5 min	Advisory (warning)	1 d
Unraid parity check overdue	The last Unraid parity check is more than 40 days old: a monthly check was missed (dumbmonit_unraid_parity_check_age_seconds).	> 40 d	1 h	Advisory (warning)	1 d
Unraid cache nearly full	An Unraid cache pool is more than 90 % full: writes fall back to the slow array, or fail (dumbmonit_unraid_disk_used_percent{role="cache"}).	> 90 %	30 min	Advisory (warning)	1 d
Unraid container stopped	A Docker container set to start with the array is not running (dumbmonit_unraid_container_autostart_stopped).	> 0	10 min	Advisory (warning)	6 h

Veeam Backup & Replication

See Veeam Backup & Replication. Jobs are labelled job and type, repositories repository.

Rule	What	Default threshold	Hold	Severity	Reminder
Veeam job failed	The last run of an enabled Veeam job failed: what it protects has no new restore point (dumbmonit_veeam_job_failed).	> 0	5 min	Warning (critical)	1 d
Veeam job ended with a warning	The last run of an enabled Veeam job ended with a warning: some objects may not be protected (dumbmonit_veeam_job_warning).	> 0	5 min	Advisory (warning)	1 d
Veeam backup too old	No successful run of a job scheduled at least daily for more than two days (dumbmonit_veeam_job_last_success_age_seconds).	> 2 d	1 h	Advisory (warning)	1 d
Veeam repository nearly full	A Veeam backup repository is more than 90 % full: the next jobs will fail for lack of space (dumbmonit_veeam_repository_used_percent).	> 90 %	30 min	Advisory (warning)	1 d
Veeam license expiring	The Veeam license expires in less than 30 days: jobs stop at the end of the grace period (dumbmonit_veeam_license_expiry_seconds).	< 30 d	1 h	Advisory (warning)	1 d

Windows without an agent

See Windows without an agent (WinRM).

Rule	What	Default threshold	Hold	Severity	Reminder
Windows automatic services stopped	One or more Windows services set to start automatically are stopped (dumbmonit_windows_services_auto_stopped).	> 0	10 min	Advisory (warning)	6 h

Kopia

See Kopia. Sources are labelled source (user@host:/path). Beta: not yet tested on a real server.

Rule	What	Default threshold	Hold	Severity	Reminder
Kopia snapshot with errors	The last snapshot of a Kopia source finished with errors: some files were not saved (dumbmonit_kopia_source_last_snapshot_errors).	> 0	5 min	Advisory (warning)	1 d
Kopia snapshot too old	A scheduled Kopia source has no snapshot for more than two days (dumbmonit_kopia_source_last_snapshot_age_seconds, scheduled sources only).	> 2 d	30 min	Advisory (warning)	1 d
Kopia repository disconnected	The Kopia server is not connected to its repository: no snapshot can run (dumbmonit_kopia_repo_connected).	< 1	10 min	Warning (critical)	6 h

Duplicati

See Duplicati. Backups are labelled backup and backup_id. Beta: not yet tested on a real server.

Rule	What	Default threshold	Hold	Severity	Reminder
Duplicati backup failed	The last run of a Duplicati backup failed: what it protects has no new version (dumbmonit_duplicati_backup_failed).	> 0	5 min	Warning (critical)	1 d
Duplicati backup too old	A scheduled Duplicati backup has not succeeded for more than two days (dumbmonit_duplicati_backup_last_success_age_seconds, scheduled backups only).	> 2 d	30 min	Advisory (warning)	1 d

Tailscale

See Tailscale. Devices are labelled device, the first label of their MagicDNS name.

Rule	What	Default threshold	Hold	Severity	Reminder
Tailscale device offline	A Tailscale device that must stay online (a tagged device by default) has been disconnected for more than 15 minutes (dumbmonit_tailscale_device_offline_seconds and on (target, device) dumbmonit_tailscale_device_watched > 0).	> 15 min	5 min	Advisory (warning)	6 h
Tailscale node key expiring	A Tailscale device’s node key expires in less than 14 days: it will leave the tailnet until someone signs it in again (dumbmonit_tailscale_device_key_expiry_seconds).	< 14 d	1 h	Advisory (warning)	1 d
Tailscale device awaiting approval	A device joined the tailnet and awaits approval: approve it if it is expected, remove it otherwise (dumbmonit_tailscale_device_authorized).	< 1	5 min	Advisory (warning)	1 d
Tailscale client update	A Tailscale device that must stay online runs a client with an update available (dumbmonit_tailscale_device_update_available and on (target, device) dumbmonit_tailscale_device_watched > 0).	> 0	6 h	Info (info)	7 d

Microsoft 365

See Microsoft 365. Rules for Microsoft 365 tenants read through Microsoft Graph: service health, licenses and risky users.

Rule	What	Default threshold	Hold	Severity	Reminder
Microsoft 365 service degraded	A Microsoft 365 service is degraded, interrupted or under investigation according to the service health dashboard. (dumbmonit_m365_services_degraded)	> 0	10 min	Advisory (warning)	6 h
Microsoft 365 licenses exhausted	Every unit of a paid license is assigned: the next user cannot be given it. (dumbmonit_m365_license_used_percent)	≥ 100 %	1 h	Advisory (warning)	1 d
Microsoft 365 licenses nearly full	More than 95 % of a paid license is assigned. (dumbmonit_m365_license_used_percent < 99.99)	> 95 %	1 h	Info (info)	7 d
Microsoft 365 users at risk	Entra ID Protection flags at least one user as at risk. (dumbmonit_m365_risky_users)	> 0	15 min	Advisory (warning)	1 d

Microsoft Entra ID

See Microsoft Entra ID. Rules for Microsoft Entra ID tenants read through Microsoft Graph: application secrets, directory sync and administrator MFA.

Rule	What	Default threshold	Hold	Severity	Reminder
Entra application secret expiring	A secret or certificate of an Entra application expires in less than 30 days: the application stops signing in on that day. (dumbmonit_entra_credential_expiry_seconds > 0)	< 30 d	1 h	Advisory (warning)	1 d
Entra application secret expired	A secret or certificate of an Entra application expired in the last 30 days: remove it, or renew it if the application still needs it. (dumbmonit_entra_credential_expiry_seconds)	expired	1 h	Advisory (warning)	1 d
Entra directory sync late	The last synchronization with the on-premises Active Directory is more than 3 hours old: check Entra Connect. (dumbmonit_entra_ad_sync_age_seconds)	> 3 h	10 min	Advisory (warning)	6 h
Entra administrator without MFA	At least one administrator has no multifactor authentication method registered. (dumbmonit_entra_admin_without_mfa)	> 0	1 h	Advisory (warning)	1 d

Microsoft Azure

See Microsoft Azure. Rules for an Azure subscription read through Resource Health and Azure Monitor alerts.

Rule	What	Default threshold	Hold	Severity	Reminder
Azure resource unavailable	Resource Health reports a resource of the subscription as unavailable for 10 minutes (not counting resources stopped by their owner). (dumbmonit_azure_resources_unavailable)	> 0	10 min	Warning (critical)	6 h
Azure resource degraded	Resource Health reports a resource of the subscription as degraded for 15 minutes. (dumbmonit_azure_resources_degraded)	> 0	15 min	Advisory (warning)	6 h
Azure Monitor alert Sev0 or Sev1	An Azure Monitor alert of severity Sev0 (critical) or Sev1 (error) is fired and not closed. (dumbmonit_azure_alerts_high_active)	> 0	5 min	Advisory (warning)	6 h

AWS CloudWatch

See AWS (CloudWatch). AWS alarms, EC2 instances and RDS databases read through CloudWatch.

Rule	What	Default threshold	Hold	Severity	Reminder
AWS CloudWatch alarm in ALARM	A CloudWatch alarm has been in the ALARM state for 5 minutes. (dumbmonit_aws_alarm_in_alarm)	> 0	5 min	Advisory (warning)	6 h
AWS EC2 status check failed	An EC2 instance has failed an instance or system status check for 10 minutes. (dumbmonit_aws_ec2_status_check_failed)	> 0	10 min	Advisory (warning)	6 h
AWS EC2 CPU high	An EC2 instance has had a CPU peak above 90 % for 30 minutes. (dumbmonit_aws_ec2_cpu_percent)	> 90 %	30 min	Advisory (warning)	6 h
AWS RDS CPU high	An RDS database has had a CPU peak above 90 % for 30 minutes. (dumbmonit_aws_rds_cpu_percent)	> 90 %	30 min	Advisory (warning)	6 h
AWS RDS free storage low	An RDS database has less than 5 GiB of free storage for 15 minutes. (dumbmonit_aws_rds_free_storage_bytes)	< 5 GiB	15 min	Advisory (warning)	6 h

Cloudflare

See Cloudflare. Rules for the zones, tunnels, certificates and load balancer pools of a Cloudflare account.

Rule	What	Default threshold	Hold	Severity	Reminder
Cloudflare tunnel down	A Cloudflare tunnel has no connection left and cannot carry traffic. (dumbmonit_cloudflare_tunnel_down)	> 0	5 min	Warning (critical)	6 h
Cloudflare tunnel degraded	A Cloudflare tunnel has lost some of its connections to the edge. (dumbmonit_cloudflare_tunnel_degraded)	> 0	15 min	Advisory (warning)	6 h
Cloudflare certificate expiring	An active certificate of a zone expires in less than 14 days; Cloudflare should have renewed it by now. (dumbmonit_cloudflare_certificate_expiry_seconds)	< 14 d	1 h	Advisory (warning)	1 d
Cloudflare zone not active	A zone is not active (pending name server change, moved or deactivated). (dumbmonit_cloudflare_zone_active)	< 1	1 h	Advisory (warning)	1 d
Cloudflare 5xx rate high	More than 5% of the responses of a zone are 5xx over the last one to two hours (zones with at least 100 requests). (dumbmonit_cloudflare_zone_http_5xx_percent)	> 5 %	15 min	Advisory (warning)	6 h
Cloudflare load balancer pool unhealthy	An enabled load balancer pool is unhealthy. (dumbmonit_cloudflare_lb_pool_healthy)	< 1	5 min	Advisory (warning)	6 h

Hetzner Cloud

See Hetzner Cloud. Rules for the servers, volumes and backups of a Hetzner Cloud project.

Rule	What	Default threshold	Hold	Severity	Reminder
Hetzner server not running	A Hetzner Cloud server is not in the running state (off, migrating, stuck starting). (dumbmonit_hetzner_server_running)	< 1	10 min	Advisory (warning)	6 h
Hetzner server CPU sustained high	A Hetzner server averages more than 90% CPU over ten minutes, for 30 minutes. (dumbmonit_hetzner_server_cpu_percent)	> 90 %	30 min	Advisory (warning)	6 h
Hetzner backup too old	The newest backup of a server with backups enabled is more than 3 days old. (dumbmonit_hetzner_server_backup_age_seconds)	> 3 d	1 h	Advisory (warning)	1 d
Hetzner volume not attached	A volume is attached to no server, and is billed anyway. (dumbmonit_hetzner_volume_attached)	< 1	1 h	Info (info)	7 d

OVHcloud

See OVHcloud. Rules for the VPS and dedicated servers of an OVHcloud account.

Rule	What	Default threshold	Hold	Severity	Reminder
OVHcloud VPS not running	An OVHcloud VPS is not in the running state for 10 minutes. (dumbmonit_ovh_vps_up)	< 1	10 min	Advisory (warning)	6 h
OVHcloud dedicated server in error	OVHcloud monitoring reports a dedicated server in error, or powered off, for 5 minutes. (dumbmonit_ovh_dedicated_up)	< 1	5 min	Warning (critical)	6 h
OVHcloud task in progress	One or more tasks (reboot, reinstall, maintenance) have been pending or running on the servers for an hour. (dumbmonit_ovh_tasks_active)	> 0	1 h	Info (info)	1 d

Infomaniak

See Infomaniak. Rules for the products of an Infomaniak account.

Rule	What	Default threshold	Hold	Severity	Reminder
Infomaniak product expiring	A product (domain, hosting, mail) expires in less than 14 days. (dumbmonit_infomaniak_product_expiry_seconds)	< 14 d	1 h	Advisory (warning)	1 d
Infomaniak product expired	The expiry date of a product has passed. (dumbmonit_infomaniak_product_expiry_seconds)	< 0	1 h	Warning (critical)	1 d
Infomaniak product locked	Infomaniak flags a product as locked for an hour. (dumbmonit_infomaniak_product_locked)	> 0	1 h	Advisory (warning)	1 d
Infomaniak product in maintenance	Infomaniak flags a product as under maintenance for an hour. (dumbmonit_infomaniak_product_maintenance)	> 0	1 h	Info (info)	1 d

FortiGate

See FortiGate. Tunnels are labelled tunnel, interfaces interface and alias, licences license.

Rule	What	Default threshold	Hold	Severity	Reminder
FortiGate IPsec tunnel down	No phase 2 of a FortiGate site-to-site IPsec tunnel is up: the site behind it is cut off (dumbmonit_fortigate_ipsec_tunnel_up).	< 1	5 min	Warning (critical)	6 h
FortiGate interface without link	An enabled FortiGate interface with an address has no link: cable, transceiver or the device in front (dumbmonit_fortigate_interface_down).	> 0	5 min	Advisory (warning)	6 h
FortiGate HA out of sync	The members of a FortiGate HA cluster no longer have the same configuration checksum: a failover would run another configuration (dumbmonit_fortigate_ha_in_sync).	< 1	15 min	Advisory (warning)	6 h
FortiGate HA member lost	A FortiGate HA cluster has fewer members than in the last 24 hours: there is no standby any more (max_over_time(dumbmonit_fortigate_ha_members[1d]) - dumbmonit_fortigate_ha_members).	> 0	5 min	Warning (critical)	6 h
FortiGate memory near conserve mode	FortiGate memory has stayed above 85 % for ten minutes: at 88 % (by default) it enters conserve mode and stops inspecting new sessions (dumbmonit_fortigate_memory_used_percent).	> 85 %	10 min	Advisory (warning)	6 h
FortiGate CPU high	FortiGate CPU has stayed above 90 % for fifteen minutes (dumbmonit_fortigate_cpu_usage_percent).	> 90 %	15 min	Advisory (warning)	6 h
FortiGate licence expiring	A FortiGuard or FortiCare licence of the FortiGate expires in less than 30 days, or has expired (dumbmonit_fortigate_license_expiry_seconds).	< 30 d	1 h	Advisory (warning)	1 d
FortiGate firmware update	FortiGuard offers a newer patch release of the FortiOS branch the FortiGate runs (dumbmonit_fortigate_firmware_update_available).	> 0	1 h	Info (info)	7 d

Sophos Firewall

See Sophos Firewall.

Rule	What	Default threshold	Hold	Severity	Reminder
Sophos interface without link	A Sophos Firewall interface that is switched on and bound to a zone has no link (dumbmonit_sophos_interface_down).	> 0	5 min	Advisory (warning)	6 h

Cisco Meraki

See Cisco Meraki (beta). Devices are labelled device, serial, model and network, uplinks interface.

Rule	What	Default threshold	Hold	Severity	Reminder
Meraki device offline	A Cisco Meraki device has been offline (out of reach of the cloud dashboard) for ten minutes. Dormant devices, unseen for a long time, are left out (dumbmonit_meraki_device_offline).	> 0	10 min	Advisory (warning)	6 h
Meraki uplink failed	A Meraki router lost the Internet access of a configured uplink (the wired and cellular sockets without a cable are not counted) (dumbmonit_meraki_uplink_failed).	> 0	5 min	Advisory (warning)	6 h
Meraki license problem	The Meraki license is not in compliance (expired, missing or out of compliance): the dashboard may stop managing the devices (dumbmonit_meraki_license_ok).	< 1	1 h	Advisory (warning)	1 d
Meraki license expiring	A Meraki license expires in less than 30 days (dumbmonit_meraki_license_expiry_seconds).	< 30 d	1 h	Advisory (warning)	1 d

TP-Link Omada

See TP-Link Omada (beta). Devices are labelled device, mac, model and site.

Rule	What	Default threshold	Hold	Severity	Reminder
Omada device offline	An Omada access point, switch or gateway has been disconnected from the controller for ten minutes (dumbmonit_omada_device_offline).	> 0	10 min	Advisory (warning)	6 h
Omada device CPU high	An Omada device has had its CPU above 90 % for fifteen minutes (dumbmonit_omada_device_cpu_usage_percent).	> 90 %	15 min	Advisory (warning)	6 h
Omada device memory high	An Omada device has had its memory above 90 % for fifteen minutes (dumbmonit_omada_device_memory_used_percent).	> 90 %	15 min	Advisory (warning)	6 h
Omada firmware update	The Omada controller offers a firmware update for a device (dumbmonit_omada_device_upgrade_available).	> 0	1 h	Info (info)	7 d

Aruba Central

See Aruba Central. Devices are labelled device, type, serial and site.

| Aruba Central device offline | Aruba Central reports an access point, switch or gateway offline (dumbmonit_arubacentral_device_online). | < 1 | 10 min | Advisory (warning) | 6 h | | Aruba Central critical alert | Aruba Central has at least one active critical alert (dumbmonit_arubacentral_alerts_active_by_severity{severity="critical"}). | > 0 | 10 min | Advisory (warning) | 6 h | | Aruba Central devices in poor health | Aruba Central rates at least one device in poor health for an hour (dumbmonit_arubacentral_devices_poor_health). | > 0 | 1 h | Info (info) | 7 d |

Stormshield SNS

Read over SNMP by the Stormshield profile; see Stormshield SNS.

| Stormshield HA node dead | A node of a Stormshield HA cluster is declared dead: there is no standby any more (dumbmonit_stormshield_ha_dead_nodes). | > 0 | 5 min | Advisory (warning) | 6 h | | Stormshield HA link faulty | A link between the nodes of a Stormshield HA cluster is faulty (dumbmonit_stormshield_ha_faulty_links). | > 0 | 5 min | Advisory (warning) | 6 h |

Palo Alto PAN-OS

See Palo Alto PAN-OS (beta). Interfaces are labelled interface and zone, licences license.

| Palo Alto interface without link | A Palo Alto firewall interface bound to a zone has no link: cable, transceiver or the device in front (dumbmonit_paloalto_interface_down). | > 0 | 5 min | Advisory (warning) | 6 h | | Palo Alto HA peer lost | The peer of a Palo Alto HA pair is no longer active or passive, or the HA link to it is down: there is no standby any more (dumbmonit_paloalto_ha_peer_up). | < 1 | 2 min | Warning (critical) | 6 h | | Palo Alto HA out of sync | The running configuration of a Palo Alto HA pair is not synchronized: a failover would run another configuration (dumbmonit_paloalto_ha_in_sync). | < 1 | 15 min | Advisory (warning) | 6 h | | Palo Alto HA member not functional | This Palo Alto firewall reports its HA state as suspended or non-functional (dumbmonit_paloalto_ha_local_functional). | < 1 | 5 min | Warning (critical) | 6 h | | Palo Alto session table filling up | The session table of a Palo Alto firewall has stayed above 90 % of its capacity for ten minutes: new sessions will be refused when it is full (dumbmonit_paloalto_session_usage_percent). | > 90 % | 10 min | Advisory (warning) | 6 h | | Palo Alto management CPU high | The management plane CPU of a Palo Alto firewall has stayed above 90 % for fifteen minutes (dumbmonit_paloalto_cpu_usage_percent). | > 90 % | 15 min | Advisory (warning) | 6 h | | Palo Alto management memory high | The management plane memory of a Palo Alto firewall has stayed above 90 % for fifteen minutes (dumbmonit_paloalto_memory_used_percent). | > 90 % | 15 min | Advisory (warning) | 6 h | | Palo Alto licence expiring | A licence or subscription of a Palo Alto firewall expires in less than 30 days, or has expired (dumbmonit_paloalto_license_expiry_seconds). | < 30 d | 1 h | Advisory (warning) | 1 d | | Palo Alto commit failed | The last configuration commit of a Palo Alto firewall failed: the running configuration is not the one that was saved (dumbmonit_paloalto_last_commit_ok). | < 1 | 5 min | Info (info) | 1 d |

SonicWall SonicOS

See SonicWall SonicOS (beta).

| SonicWall interface without link | A SonicWall interface bound to a zone has no link (dumbmonit_sonicwall_interface_down). | > 0 | 5 min | Advisory (warning) | 6 h |

QNAP QTS

See QNAP QTS / QuTS hero. Volumes are labelled volume, disks disk and model.

| QNAP volume nearly full | A QNAP volume is more than 90 % full: shares, snapshots and apps stop being able to write (dumbmonit_qnap_volume_used_percent). | > 90 % | 30 min | Advisory (warning) | 1 d | | QNAP disk health not good | The SMART health of a QNAP disk is no longer good (warning or abnormal): replace it before the RAID loses redundancy (dumbmonit_qnap_disk_ok). | < 1 | 15 min | Advisory (warning) | 6 h | | QNAP disk too hot | A QNAP disk has stayed above 55 °C for fifteen minutes (dumbmonit_qnap_disk_temperature_celsius). | > 55 °C | 15 min | Advisory (warning) | 6 h | | QNAP processor too hot | The QNAP processor has stayed above 90 °C for fifteen minutes (dumbmonit_qnap_cpu_temperature_celsius). | > 90 °C | 15 min | Advisory (warning) | 6 h | | QNAP firmware update | QNAP offers a newer QTS or QuTS hero release (dumbmonit_qnap_firmware_update_available). | > 0 | 1 h | Info (info) | 7 d |

Ceph

See Ceph. OSDs are labelled osd and host, pools pool.

| Ceph health error | The Ceph cluster reports HEALTH_ERR: data may be unavailable or at risk (dumbmonit_ceph_health_status). | > 1 | 5 min | Warning (critical) | 1 h | | Ceph health warning | The Ceph cluster has reported HEALTH_WARN for 30 minutes: see its health checks (dumbmonit_ceph_health_status). | > 0 | 30 min | Advisory (warning) | 6 h | | Ceph OSD down | One or more Ceph OSDs are down: the cluster rebuilds their data elsewhere and loses redundancy meanwhile (dumbmonit_ceph_osds_down). | > 0 | 10 min | Advisory (warning) | 6 h | | Ceph placement groups not clean | Some Ceph placement groups have not been active+clean for 30 minutes: data is degraded, misplaced or inactive (dumbmonit_ceph_pgs_unclean). | > 0 | 30 min | Advisory (warning) | 6 h | | Ceph objects unfound | Ceph reports unfound objects: no copy of some data can be found (dumbmonit_ceph_objects_unfound). | > 0 | 5 min | Warning (critical) | 1 h | | Ceph capacity high | The Ceph cluster is more than 80 % full: it turns read-only at 95 %, and rebuilding after a failure needs free space (dumbmonit_ceph_capacity_used_percent). | > 80 % | 30 min | Advisory (warning) | 1 d | | Ceph OSD nearly full | A Ceph OSD is more than 85 % full (the default nearfull ratio): writes to it stop at the full ratio (dumbmonit_ceph_osd_used_percent). | > 85 % | 15 min | Advisory (warning) | 12 h | | Ceph pool nearly full | A Ceph pool is more than 90 % full (dumbmonit_ceph_pool_used_percent). | > 90 % | 15 min | Advisory (warning) | 12 h | | Ceph monitor out of quorum | A Ceph monitor is out of the quorum: one more loss and the cluster stops (dumbmonit_ceph_mons_out_of_quorum). | > 0 | 5 min | Warning (critical) | 1 h |

MinIO

See MinIO.

| MinIO node offline | A MinIO node is offline: the cluster runs with less parity (dumbmonit_minio_nodes_offline). | > 0 | 5 min | Warning (critical) | 1 h | | MinIO drive offline | A MinIO drive is offline: objects are rebuilt from parity until it is back (dumbmonit_minio_drives_offline). | > 0 | 5 min | Advisory (warning) | 6 h | | MinIO capacity high | The usable capacity of the MinIO cluster is more than 85 % used (dumbmonit_minio_capacity_usable_used_percent). | > 85 % | 30 min | Advisory (warning) | 1 d | | MinIO heal failures | MinIO could not heal some objects in its current self-healing run (dumbmonit_minio_heal_objects_failed). | > 0 | 30 min | Advisory (warning) | 6 h | | MinIO replication failures | Objects of a MinIO bucket failed to replicate to the remote site (dumbmonit_minio_replication_failed_objects). | > 0 | 30 min | Advisory (warning) | 6 h | | MinIO S3 server errors | More than 5 % of the S3 requests MinIO served in the last 10 minutes failed with a server error (5xx) (100 * rate(dumbmonit_minio_s3_requests_5xx_total[10m]) / rate(dumbmonit_minio_s3_requests_total[10m])). | > 5 % | 10 min | Advisory (warning) | 6 h |

KVM (libvirt)

Reported by the Linux agent on a KVM host; see Agent.

Rule	What	Default threshold	Hold	Severity	Reminder
KVM domain crashed	libvirt reports a KVM domain as crashed: the hypervisor had to stop it (dumbmonit_agent_libvirt_domain_crashed).	> 0	1 min	Warning (critical)	1 h
libvirt pool almost full	A libvirt storage pool’s allocation reaches 90% of its capacity (dumbmonit_agent_libvirt_pool_used_percent).	≥ 90 % (clears below 88 %)	15 min	Advisory (warning), escalates after 24 h	6 h

Synology NAS (agent package)

Reported by the agent of the Synology package. A UPS plugged into the NAS is reported under the NUT names, so the UPS behind NUT rules apply to it; the SMART verdict, when smartctl is readable, goes through “Disk SMART failing”.

Rule	What	Default threshold	Hold	Severity	Reminder
NAS RAID degraded	A RAID array of the NAS lost a disk or is rebuilding (dumbmonit_agent_dsm_raid_status: 0 normal, 1 resyncing, 2 degraded, 3 inactive).	≥ 2	5 min	Warning (critical)	6 h
NAS volume read-only	A /volumeN is mounted read-only, which DSM does to a crashed volume (dumbmonit_agent_dsm_volume_read_only).	> 0	5 min	Warning (critical)	6 h
NAS disk temperature high	A disk is above 55 °C (dumbmonit_agent_dsm_disk_temperature_celsius); clears below 52 °C.	> 55 °C	15 min	Advisory (warning)	6 h
NAS disk bad sectors growing	New unreadable sectors appeared in the last 24 hours (delta(dumbmonit_agent_dsm_disk_unc_count[24h])).	> 0	15 min	Advisory (warning)	24 h
NAS SSD wearing out	An SSD has less than 10 % of its rated life left (dumbmonit_agent_dsm_disk_remaining_life_percent); clears above 12 %.	< 10 %	1 h	Advisory (warning)	7 d
NAS package stopped	A package that should run (enabled) is stopped (dumbmonit_agent_dsm_package_down). Needs synopkg to answer the agent; a package stopped by hand does not alert.	> 0	15 min	Advisory (warning)	24 h

XCP-ng / XenServer

See XCP-ng / XenServer.

Rule	What	Default threshold	Hold	Severity	Reminder
XCP-ng host offline	A host of the XCP-ng pool no longer answers the coordinator (dumbmonit_xcpng_host_live).	< 1	5 min	Warning (critical)	1 h
XCP-ng SR almost full	An XCP-ng storage repository is more than 90% full (dumbmonit_xcpng_sr_used_percent).	≥ 90 % (clears below 88 %)	15 min	Advisory (warning), escalates after 24 h	6 h
XCP-ng HA-protected VM down	A VM protected by the pool’s high availability is halted (dumbmonit_xcpng_vm_ha_protected_down).	> 0	2 min	Warning (critical)	1 h
XCP-ng pool HA overcommitted	The pool no longer has a plan to survive the host failures it is set to tolerate (dumbmonit_xcpng_pool_ha_overcommitted).	> 0	5 min	Advisory (warning), escalates after 1 h	6 h

Nutanix

See Nutanix AHV.

Rule	What	Default threshold	Hold	Severity	Reminder
Nutanix host degraded	Prism reports a Nutanix host as degraded (dumbmonit_nutanix_host_degraded).	> 0	5 min	Warning (critical)	1 h
Nutanix storage container almost full	A Nutanix storage container is more than 90% full (dumbmonit_nutanix_storage_container_used_percent).	≥ 90 % (clears below 88 %)	15 min	Advisory (warning), escalates after 24 h	6 h
Nutanix critical alerts	Prism Central reports one or more unresolved critical alerts (dumbmonit_nutanix_alerts_critical).	> 0	5 min	Warning (critical)	1 h

Hyper-V

Reported by the Windows agent on a Hyper-V host; see Agent.

Rule	What	Default threshold	Hold	Severity	Reminder
Hyper-V VM health critical	Hyper-V reports a virtual machine in critical health: a resource it needs, most often disk space, is exhausted (dumbmonit_hyperv_vms_health_critical).	> 0	5 min	Warning (critical)	6 h
Hyper-V host CPU high	The Hyper-V host’s logical processors have been more than 90 % busy for fifteen minutes, guests included (dumbmonit_hyperv_host_cpu_percent).	> 90 %	15 min	Advisory (warning)	6 h
Hyper-V virtual disk errors	A Hyper-V virtual disk reported I/O errors in the last hour (increase_prometheus(dumbmonit_hyperv_vhd_errors_total[1h])).	> 0	5 min	Advisory (warning)	6 h

Security score

Computed by the server every 15 minutes for every monitor whose kind has security checks, and stored as dumbmonit_security_score (0–100), only while the security score is turned on in Settings (off by default). See Security score.

Rule	What	Default threshold	Hold	Severity	Reminder
Security score dropped	The score fell by 10 points or more against its best value of the last 24 hours (max_over_time(dumbmonit_security_score[1d]) - dumbmonit_security_score): a check started failing.	≥ 10 pts	30 min	Advisory (warning)	24 h
Security score low	The score is below 40, grade F (dumbmonit_security_score). Raise or lower the threshold to match your own bar.	< 40	1 h	Info (info)	7 d

Network inventory

Raised from the scheduled network scans and their inventory (see Scheduled scans and inventory). All three rules are disabled by default; the first two have severity info, the MAC change one warning: turn them on in the rules list when you want them. There is one series, so one alert, per new device or port; it stays open until the item is marked as known (the metric stops, the alert resolves within a few minutes) and has no reminder. The first scan of a network never raises anything.

Rule	What	Default threshold	Hold	Severity	Reminder
New device on the network	A scheduled scan found a device that is not in the inventory (dumbmonit_netscan_unknown_device).	> 0	none	Info (info), disabled	none
New open port on the network	A scheduled scan found a new open port on a known device (dumbmonit_netscan_unknown_port).	> 0	none	Info (info), disabled	none
MAC address changed for an IP	A new device took the address of a known device under another MAC address: spoofing or replaced hardware (dumbmonit_netscan_mac_change). Open until marked as known or ignored.	> 0	none	Advisory (warning), disabled	none

DumbMonit itself

Rule	What	Default threshold	Hold	Severity	Reminder
DumbMonit backup did not run	The scheduled local backup of the DumbMonit database has not run for more than two days (time() - dumbmonit_instance_backup_last_success_seconds).	> 2 d	1 h	Advisory (warning)	24 h
DumbMonit data volume almost full	The volume that holds /data has less than 10% free space (100 * dumbmonit_instance_data_free_bytes / dumbmonit_instance_data_size_bytes).	< 10 %	15 min	Advisory (warning)	24 h
DumbMonit metrics database restarting in a loop	The embedded VictoriaMetrics was restarted three times or more in 30 minutes (increase_prometheus(dumbmonit_instance_vm_restarts_total[30m])).	≥ 3	1 min	Warning (critical)	6 h
DumbMonit scheduler stalled	No scheduling round for more than two minutes: monitors are no longer polled (dumbmonit_instance_scheduler_lag_seconds).	> 120 s	5 min	Warning (critical)	6 h
DumbMonit polls running late	Monitors stay overdue after every scheduling round (min_over_time(dumbmonit_instance_scheduler_backlog[15m])).	> 0	15 min	Advisory (warning)	24 h
DumbMonit metric writes failing	Batches refused by VictoriaMetrics or samples dropped in the last 15 minutes (dumbmonit_instance_sample_writes_failed_total, dumbmonit_instance_samples_dropped_total).	> 0	5 min	Advisory (warning)	6 h
DumbMonit database growing fast	dumbmonit.db more than doubled in a day and is over 100 MB (dumbmonit_instance_database_bytes).	> 2×	1 h	Advisory (warning)	24 h

These rules and the outgoing heartbeat are explained in Watching DumbMonit itself.

Every built-in rule applies to all monitors and to every enabled channel.

Editing a rule in the UI

On the Alerts page, the Rules section lists every rule with its severity, a Built-in mark and, when relevant, how many alerts it is firing now. Each rule has:

• a toggle to enable or disable it;
• Edit, which unfolds an inline editor for name, description, operator, threshold, hold (for), severity, reminder (repeat every) and escalation (escalate after). The query of a built-in rule is shown but not editable; the query of your own rules is. Baseline rules show their detection parameters read-only;
• Delete, for your own rules only.

Per-monitor overrides

A rule can be tuned for one monitor without touching the rule itself: a different threshold, a different clear threshold, or turned off for that monitor alone. Each rule’s editor has a Per-monitor overrides panel to add or remove one directly.

The one-click Ignore action on an alert (in the Now tab or the alert’s monitor page) is the same mechanism, written with enabled: false: the monitor stops carrying that rule, immediately, reversibly. The monitor page lists what it ignores, with Stop ignoring; the rule itself shows Ignored on N monitors in Alerts → Rules, where the same per-monitor overrides panel removes it. See Per-monitor overrides for the API.

A monitor’s Edit page also lists, under Monitored alerts, every rule that reads a metric the monitor has written in the last 24 hours: for an agent with Docker, the container rules; for a website monitor, the probe rules. Each has a switch, on by default. Turning one off writes the same enabled: false override when you save the form; the data is still collected and graphed. A monitor added a moment ago shows the list after its first checks.

Creating a threshold rule

Click New rule. The form needs:

Field	Meaning
Name	Shown in alerts and notifications.
Query	A MetricsQL expression, evaluated per monitor. Example: dumbmonit_cpu_usage_percent.
Operator	>, >=, < or <=.
Threshold	The number the query result is compared with.
Severity	Info, Advisory or Warning.
Hold for	Seconds the condition must last before firing. A non-zero hold absorbs an isolated bad sample.

Every series returned by the query becomes one potential alert, attached to the monitor named by its target label. Aggregate with avg by (target, host) (…) when you want one alert per monitor rather than one per core or per interface. The alert’s identity ignores the host and tag_* labels whenever target is present, so renaming a monitor keeps its alerts; a series whose target does not match an existing, enabled monitor is ignored.

The query language

Queries are MetricsQL, the PromQL superset of VictoriaMetrics. The metrics are the dumbmonit_* series described in the metrics reference, and every series carries a target label (the monitor id) and a host label (its name).

Some patterns used by the built-in rules:

# Age of the last sample, freshest series per device: what "unreachable" means
bottomk by (target) (1, time() - tlast_over_time(dumbmonit_up[7d]))

# One value per device, whatever the source
avg by (target, host) (dumbmonit_cpu_load_percent or dumbmonit_proxmox_node_cpu_percent or dumbmonit_cpu_usage_percent)

# A percentage computed from two gauges
100 * dumbmonit_storage_bytes_used / dumbmonit_storage_bytes_total

# A boolean condition: the series is returned only when true
dumbmonit_ups_output_source == 5

# Extrapolation done by VictoriaMetrics
predict_linear(dumbmonit_pbs_datastore_used_percent[6h], 345600) and deriv(dumbmonit_pbs_datastore_used_percent[6h]) > 0

# Availability of a service over thirty days
avg_over_time(dumbmonit_probe_success[30d])

Try a query first

GET /api/metrics/query?query=… returns what the rule would evaluate (see the API reference). In development, the overlay publishes the embedded VictoriaMetrics on the host’s :8428, with its query UI.

Rule kinds in the API

kind is threshold (compare with a threshold), predict (same comparison, on a predict_linear query; shown as a forecast) or anomaly (seasonal baseline; params holds k, alpha, mad_floor_abs, mad_floor_rel, min_samples). The UI creates threshold rules; the other two kinds can be created through the API.