ansible-infra/resources/chaosknoten/grafana/docker_compose/prometheus_alerts.rules.yaml

# Links & Resources:
# - https://samber.github.io/awesome-prometheus-alerts/rules
groups:
  - name: node-exporter-memory
    rules:
      - alert: HostOutOfMemory
        expr: (node_memory_MemAvailable_bytes / node_memory_MemTotal_bytes * 100 < 10) * on(instance) group_left (nodename) node_uname_info{nodename=~".+"}
        for: 2m
        labels:
          severity: warning
        annotations:
          summary: Host out of memory (instance {{ $labels.instance }})
          description: "Node memory is filling up (< 10% left)\n  VALUE = {{ $value }}"
      - alert: HostMemoryUnderMemoryPressure
        expr: (rate(node_vmstat_pgmajfault[1m]) > 1000) * on(instance) group_left (nodename) node_uname_info{nodename=~".+"}
        for: 2m
        labels:
          severity: warning
        annotations:
          summary: Host memory under memory pressure (instance {{ $labels.instance }})
          description: "The node is under heavy memory pressure. High rate of major page faults\n  VALUE = {{ $value }}"
      # You may want to increase the alert manager 'repeat_interval' for this type of alert to daily or weekly
      - alert: HostMemoryIsUnderutilized
        expr: (100 - (avg_over_time(node_memory_MemAvailable_bytes[30m]) / node_memory_MemTotal_bytes * 100) < 10) * on(instance) group_left (nodename) node_uname_info{nodename=~".+"}
        for: 1w
        labels:
          severity: info
        annotations:
          summary: Host Memory is underutilized (instance {{ $labels.instance }})
          description: "Node memory is < 10% for 1 week. Consider reducing memory space. (instance {{ $labels.instance }})\n  VALUE = {{ $value }}"
      - alert: HostSwapIsFillingUp
        expr: ((1 - (node_memory_SwapFree_bytes / node_memory_SwapTotal_bytes)) * 100 > 80) * on(instance) group_left (nodename) node_uname_info{nodename=~".+"}
        for: 2m
        labels:
          severity: warning
        annotations:
          summary: Host swap is filling up (instance {{ $labels.instance }})
          description: "Swap is filling up (>80%)\n  VALUE = {{ $value }}"
      - alert: HostOomKillDetected
        expr: (increase(node_vmstat_oom_kill[1m]) > 0) * on(instance) group_left (nodename) node_uname_info{nodename=~".+"}
        for: 0m
        labels:
          severity: warning
        annotations:
          summary: Host OOM kill detected (instance {{ $labels.instance }})
          description: "OOM kill detected\n  VALUE = {{ $value }}"
      - alert: HostEdacCorrectableErrorsDetected
        expr: (increase(node_edac_correctable_errors_total[1m]) > 0) * on(instance) group_left (nodename) node_uname_info{nodename=~".+"}
        for: 0m
        labels:
          severity: info
        annotations:
          summary: Host EDAC Correctable Errors detected (instance {{ $labels.instance }})
          description: "Host {{ $labels.instance }} has had {{ printf \"%.0f\" $value }} correctable memory errors reported by EDAC in the last 5 minutes.\n  VALUE = {{ $value }}"
      - alert: HostEdacUncorrectableErrorsDetected
        expr: (node_edac_uncorrectable_errors_total > 0) * on(instance) group_left (nodename) node_uname_info{nodename=~".+"}
        for: 0m
        labels:
          severity: warning
        annotations:
          summary: Host EDAC Uncorrectable Errors detected (instance {{ $labels.instance }})
          description: "Host {{ $labels.instance }} has had {{ printf \"%.0f\" $value }} uncorrectable memory errors reported by EDAC in the last 5 minutes.\n  VALUE = {{ $value }}"

  - name: node-exporter-network
    rules:
      - alert: HostUnusualNetworkThroughputIn
        expr: (sum by (instance) (rate(node_network_receive_bytes_total[2m])) / 1024 / 1024 > 100) * on(instance) group_left (nodename) node_uname_info{nodename=~".+"}
        for: 5m
        labels:
          severity: warning
        annotations:
          summary: Host unusual network throughput in (instance {{ $labels.instance }})
          description: "Host network interfaces are probably receiving too much data (> 100 MB/s)\n  VALUE = {{ $value }}"
      - alert: HostUnusualNetworkThroughputOut
        expr: (sum by (instance) (rate(node_network_transmit_bytes_total[2m])) / 1024 / 1024 > 100) * on(instance) group_left (nodename) node_uname_info{nodename=~".+"}
        for: 5m
        labels:
          severity: warning
        annotations:
          summary: Host unusual network throughput out (instance {{ $labels.instance }})
          description: "Host network interfaces are probably sending too much data (> 100 MB/s)\n  VALUE = {{ $value }}"
      # General network receive error alerts.
      # Excluding: OPNsense hosts
      - alert: HostNetworkReceiveErrors
        expr: (rate(node_network_receive_errs_total[2m]) / rate(node_network_receive_packets_total[2m]) > 0.01) * on(instance) group_left (nodename) node_uname_info{nodename=~".+", nodename!="OPNsense"}
        for: 2m
        labels:
          severity: warning
        annotations:
          summary: Host Network Receive Errors (instance {{ $labels.instance }})
          description: "Host {{ $labels.instance }} interface {{ $labels.device }} has encountered {{ printf \"%.0f\" $value }} receive errors in the last two minutes.\n  VALUE = {{ $value }}"
      # OPNsense network receive error alerts.
      # This is the same as the regular network receive error alerts, but excluding the WireGuard interfaces as they like to throw errors, but which aren't of importance.
      - alert: OPNsenseHostNetworkReceiveErrors
        expr: (rate(node_network_receive_errs_total{device!~"wg.+"}[2m]) / rate(node_network_receive_packets_total{device!~"wg.+"}[2m]) > 0.01) * on(instance) group_left (nodename) node_uname_info{nodename="OPNsense"}
        for: 2m
        labels:
          severity: warning
        annotations:
          summary: OPNsense host Network Receive Errors (instance {{ $labels.instance }})
          description: "Host {{ $labels.instance }} interface {{ $labels.device }} has encountered {{ printf \"%.0f\" $value }} receive errors in the last two minutes.\n  VALUE = {{ $value }}"
      - alert: HostNetworkTransmitErrors
        expr: (rate(node_network_transmit_errs_total[2m]) / rate(node_network_transmit_packets_total[2m]) > 0.01) * on(instance) group_left (nodename) node_uname_info{nodename=~".+"}
        for: 2m
        labels:
          severity: warning
        annotations:
          summary: Host Network Transmit Errors (instance {{ $labels.instance }})
          description: "Host {{ $labels.instance }} interface {{ $labels.device }} has encountered {{ printf \"%.0f\" $value }} transmit errors in the last two minutes.\n  VALUE = {{ $value }}"
      - alert: HostNetworkBondDegraded
        expr: ((node_bonding_active - node_bonding_slaves) != 0) * on(instance) group_left (nodename) node_uname_info{nodename=~".+"}
        for: 2m
        labels:
          severity: warning
        annotations:
          summary: Host Network Bond Degraded (instance {{ $labels.instance }})
          description: "Bond \"{{ $labels.device }}\" degraded on \"{{ $labels.instance }}\".\n  VALUE = {{ $value }}"
      - alert: HostConntrackLimit
        expr: (node_nf_conntrack_entries / node_nf_conntrack_entries_limit > 0.8) * on(instance) group_left (nodename) node_uname_info{nodename=~".+"}
        for: 5m
        labels:
          severity: warning
        annotations:
          summary: Host conntrack limit (instance {{ $labels.instance }})
          description: "The number of conntrack is approaching limit\n  VALUE = {{ $value }}"

  - name: node-exporter-disk
    rules:
      # General high disk read and write rate alerts.
      # Excluding: hypervisor hosts, CI hosts
      - alert: HostUnusualDiskReadRate
        expr: (sum by (instance) (rate(node_disk_read_bytes_total[2m])) / 1024 / 1024 > 50) * on(instance) group_left (nodename) node_uname_info{nodename=~".+", nodename!="forgejo-actions-runner", nodename!="woodpecker", nodename!="chaosknoten"}
        for: 5m
        labels:
          severity: warning
        annotations:
          summary: Host unusual disk read rate (instance {{ $labels.instance }})
          description: "Disk is probably reading too much data (> 50 MB/s)\n  VALUE = {{ $value }}"
      - alert: HostUnusualDiskWriteRate
        expr: (sum by (instance) (rate(node_disk_written_bytes_total[2m])) / 1024 / 1024 > 50) * on(instance) group_left (nodename) node_uname_info{nodename=~".+", nodename!="forgejo-actions-runner", nodename!="woodpecker", nodename!="chaosknoten"}
        for: 2m
        labels:
          severity: warning
        annotations:
          summary: Host unusual disk write rate (instance {{ $labels.instance }})
          description: "Disk is probably writing too much data (> 50 MB/s)\n  VALUE = {{ $value }}"
      # CI hosts high disk read and write alerts.
      # Longer intervals to account for disk intensive CI tasks.
      - alert: CIHostUnusualDiskReadRate
        expr: (sum by (instance) (rate(node_disk_read_bytes_total[2m])) / 1024 / 1024 > 50) * on(instance) group_left (nodename) node_uname_info{nodename="forgejo-actions-runner", nodename="woodpecker"}
        for: 10m
        labels:
          severity: warning
        annotations:
          summary: CI host unusual disk read rate for 10 min (instance {{ $labels.instance }})
          description: "Disk is probably reading too much data (> 50 MB/s)\n  VALUE = {{ $value }}"
      - alert: VirtualHostUnusualDiskWriteRate
        expr: (sum by (instance) (rate(node_disk_written_bytes_total[2m])) / 1024 / 1024 > 50) * on(instance) group_left (nodename) node_uname_info{nodename="forgejo-actions-runner", nodename="woodpecker"}
        for: 4m
        labels:
          severity: warning
        annotations:
          summary: CI host unusual disk write rate for 4 min (instance {{ $labels.instance }})
          description: "Disk is probably writing too much data (> 50 MB/s)\n  VALUE = {{ $value }}"
      # Hypervisor host high disk read and write alerts.
      # Longer intervals to account for disk intensive hypervisor tasks (backups, moving VMs, etc.).
      - alert: HypervisorHostUnusualDiskReadRate
        expr: (sum by (instance) (rate(node_disk_read_bytes_total[2m])) / 1024 / 1024 > 50) * on(instance) group_left (nodename) node_uname_info{nodename="chaosknoten"}
        for: 90m
        labels:
          severity: warning
        annotations:
          summary: Hypervisor host unusual disk read rate (instance {{ $labels.instance }})
          description: "Disk is probably reading too much data (> 50 MB/s)\n  VALUE = {{ $value }}"
      - alert: HypervisorHostUnusualDiskWriteRate
        expr: (sum by (instance) (rate(node_disk_written_bytes_total[2m])) / 1024 / 1024 > 50) * on(instance) group_left (nodename) node_uname_info{nodename="chaosknoten"}
        for: 90m
        labels:
          severity: warning
        annotations:
          summary: Hypervisor host unusual disk write rate (instance {{ $labels.instance }})
          description: "Disk is probably writing too much data (> 50 MB/s)\n  VALUE = {{ $value }}"
      # Please add ignored mountpoints in node_exporter parameters like
      # "--collector.filesystem.ignored-mount-points=^/(sys|proc|dev|run)($|/)".
      # Same rule using "node_filesystem_free_bytes" will fire when disk fills for non-root users.
      - alert: HostOutOfDiskSpace
        expr: ((node_filesystem_avail_bytes * 100) / node_filesystem_size_bytes < 10 and ON (instance, device, mountpoint) node_filesystem_readonly == 0) * on(instance) group_left (nodename) node_uname_info{nodename=~".+"}
        for: 2m
        labels:
          severity: warning
        annotations:
          summary: Host out of disk space (instance {{ $labels.instance }})
          description: "Disk is almost full (< 10% left)\n  VALUE = {{ $value }}"
      # Please add ignored mountpoints in node_exporter parameters like
      # "--collector.filesystem.ignored-mount-points=^/(sys|proc|dev|run)($|/)".
      # Same rule using "node_filesystem_free_bytes" will fire when disk fills for non-root users.
      - alert: HostDiskWillFillIn24Hours
        expr: ((node_filesystem_avail_bytes * 100) / node_filesystem_size_bytes < 10 and ON (instance, device, mountpoint) predict_linear(node_filesystem_avail_bytes{fstype!~"tmpfs"}[1h], 24 * 3600) < 0 and ON (instance, device, mountpoint) node_filesystem_readonly == 0) * on(instance) group_left (nodename) node_uname_info{nodename=~".+"}
        for: 2m
        labels:
          severity: warning
        annotations:
          summary: Host disk will fill in 24 hours (instance {{ $labels.instance }})
          description: "Filesystem is predicted to run out of space within the next 24 hours at current write rate\n  VALUE = {{ $value }}"
      - alert: HostOutOfInodes
        expr: (node_filesystem_files_free{fstype!="msdosfs"} / node_filesystem_files{fstype!="msdosfs"} * 100 < 10 and ON (instance, device, mountpoint) node_filesystem_readonly == 0) * on(instance) group_left (nodename) node_uname_info{nodename=~".+"}
        for: 2m
        labels:
          severity: warning
        annotations:
          summary: Host out of inodes (instance {{ $labels.instance }})
          description: "Disk is almost running out of available inodes (< 10% left)\n  VALUE = {{ $value }}"
      - alert: HostInodesWillFillIn24Hours
        expr: (node_filesystem_files_free{fstype!="msdosfs"} / node_filesystem_files{fstype!="msdosfs"} * 100 < 10 and predict_linear(node_filesystem_files_free{fstype!="msdosfs"}[1h], 24 * 3600) < 0 and ON (instance, device, mountpoint) node_filesystem_readonly{fstype!="msdosfs"} == 0) * on(instance) group_left (nodename) node_uname_info{nodename=~".+"}
        for: 2m
        labels:
          severity: warning
        annotations:
          summary: Host inodes will fill in 24 hours (instance {{ $labels.instance }})
          description: "Filesystem is predicted to run out of inodes within the next 24 hours at current write rate\n  VALUE = {{ $value }}"
      - alert: HostFilesystemDeviceError
        expr: node_filesystem_device_error == 1
        for: 2m
        labels:
          severity: critical
        annotations:
          summary: Host filesystem device error (instance {{ $labels.instance }})
          description: "{{ $labels.instance }}: Device error with the {{ $labels.mountpoint }} filesystem\n  VALUE = {{ $value }}"
      - alert: HostUnusualDiskReadLatency
        expr: (rate(node_disk_read_time_seconds_total[1m]) / rate(node_disk_reads_completed_total[1m]) > 0.1 and rate(node_disk_reads_completed_total[1m]) > 0) * on(instance) group_left (nodename) node_uname_info{nodename=~".+"}
        for: 2m
        labels:
          severity: warning
        annotations:
          summary: Host unusual disk read latency (instance {{ $labels.instance }})
          description: "Disk latency is growing (read operations > 100ms)\n  VALUE = {{ $value }}"
      - alert: HostUnusualDiskWriteLatency
        expr: (rate(node_disk_write_time_seconds_total[1m]) / rate(node_disk_writes_completed_total[1m]) > 0.1 and rate(node_disk_writes_completed_total[1m]) > 0) * on(instance) group_left (nodename) node_uname_info{nodename=~".+"}
        for: 2m
        labels:
          severity: warning
        annotations:
          summary: Host unusual disk write latency (instance {{ $labels.instance }})
          description: "Disk latency is growing (write operations > 100ms)\n  VALUE = {{ $value }}"
      # General unusual disk io alerts.
      # Excluding: hypervisor hosts
      - alert: HostUnusualDiskIo
        expr: (rate(node_disk_io_time_seconds_total[1m]) > 0.5) * on(instance) group_left (nodename) node_uname_info{nodename=~".+", nodename!="chaosknoten"}
        for: 5m
        labels:
          severity: warning
        annotations:
          summary: Host unusual disk IO (instance {{ $labels.instance }})
          description: "Time spent in IO is too high on {{ $labels.instance }}. Check storage for issues.\n  VALUE = {{ $value }}"
      # Hypervisor host unusual hard disk io alerts.
      # Since hard disks on the hypervisor can easily have their IO saturated by hypervisor tasks (backups, moving VMs, etc.), alert when the IO is above the regular threshold for a very long time.
      - alert: HypervisorHostUnusualHardDiskIo
        expr: (rate(node_disk_io_time_seconds_total{device=~"s.+"}[1m]) > 0.5) * on(instance) group_left (nodename) node_uname_info{nodename="chaosknoten"}
        for: 90m
        labels:
          severity: warning
        annotations:
          summary: Hypervisor host unusual hard disk IO (instance {{ $labels.instance }})
          description: "Time spent in IO is too high on {{ $labels.instance }}. Check storage for issues.\n  VALUE = {{ $value }}"
      # Hypervisor host unusual other (non-hard) disk io alerts.
      # This is the same as the regular unsual disk io alerts.
      - alert: HypervisorHostUnusualOtherDiskIo
        expr: (rate(node_disk_io_time_seconds_total{device!~"s.+"}[1m]) > 0.5) * on(instance) group_left (nodename) node_uname_info{nodename="chaosknoten"}
        for: 5m
        labels:
          severity: warning
        annotations:
          summary: Hypervisor host unusual other (non-hard) disk IO (instance {{ $labels.instance }})
          description: "Time spent in IO is too high on {{ $labels.instance }}. Check storage for issues.\n  VALUE = {{ $value }}"
      - alert: HostRaidArrayGotInactive
        expr: (node_md_state{state="inactive"} > 0) * on(instance) group_left (nodename) node_uname_info{nodename=~".+"}
        for: 0m
        labels:
          severity: critical
        annotations:
          summary: Host RAID array got inactive (instance {{ $labels.instance }})
          description: "RAID array {{ $labels.device }} is in a degraded state due to one or more disk failures. The number of spare drives is insufficient to fix the issue automatically.\n  VALUE = {{ $value }}"
      - alert: HostRaidDiskFailure
        expr: (node_md_disks{state="failed"} > 0) * on(instance) group_left (nodename) node_uname_info{nodename=~".+"}
        for: 2m
        labels:
          severity: warning
        annotations:
          summary: Host RAID disk failure (instance {{ $labels.instance }})
          description: "At least one device in RAID array on {{ $labels.instance }} failed. Array {{ $labels.md_device }} needs attention and possibly a disk swap\n  VALUE = {{ $value }}"

  - name: node-exporter-cpu
    rules:
      - alert: HostHighCpuLoad
        expr: (sum by (instance) (avg by (mode, instance) (rate(node_cpu_seconds_total{mode!="idle"}[2m]))) > 0.8) * on(instance) group_left (nodename) node_uname_info{nodename=~".+"}
        for: 10m
        labels:
          severity: warning
        annotations:
          summary: Host high CPU load (instance {{ $labels.instance }})
          description: "CPU load is > 80%\n  VALUE = {{ $value }}"
      # We might want to introduce that later, tho maybe excluding hosts with one core, if possible and only for VMs?
      # # You may want to increase the alert manager 'repeat_interval' for this type of alert to daily or weekly
      # - alert: HostCpuIsUnderutilized
      #   expr: (100 - (rate(node_cpu_seconds_total{mode="idle"}[30m]) * 100) < 20) * on(instance) group_left (nodename) node_uname_info{nodename=~".+"}
      #   for: 1w
      #   labels:
      #     severity: info
      #   annotations:
      #     summary: Host CPU is underutilized (instance {{ $labels.instance }})
      #     description: "CPU load is < 20% for 1 week. Consider reducing the number of CPUs.\n  VALUE = {{ $value }}"
      - alert: HostCpuStealNoisyNeighbor
        expr: (avg by(instance) (rate(node_cpu_seconds_total{mode="steal"}[5m])) * 100 > 10) * on(instance) group_left (nodename) node_uname_info{nodename=~".+"}
        for: 0m
        labels:
          severity: warning
        annotations:
          summary: Host CPU steal noisy neighbor (instance {{ $labels.instance }})
          description: "CPU steal is > 10%. A noisy neighbor is killing VM performances or a spot instance may be out of credit.\n  VALUE = {{ $value }}"
      - alert: HostCpuHighIowait
        expr: (avg by (instance) (rate(node_cpu_seconds_total{mode="iowait"}[5m])) * 100 > 10) * on(instance) group_left (nodename) node_uname_info{nodename=~".+"}
        for: 0m
        labels:
          severity: warning
        annotations:
          summary: Host CPU high iowait (instance {{ $labels.instance }})
          description: "CPU iowait > 10%. A high iowait means that you are disk or network bound.\n  VALUE = {{ $value }}"
      # # x2 context switches is an arbitrary number.
      # # The alert threshold depends on the nature of the application.
      # # Please read: https://github.com/samber/awesome-prometheus-alerts/issues/58
      # - alert: HostContextSwitchingHigh
      #   expr: (rate(node_context_switches_total[15m])/count without(mode,cpu) (node_cpu_seconds_total{mode="idle"})) / (rate(node_context_switches_total[1d])/count without(mode,cpu) (node_cpu_seconds_total{mode="idle"})) > 2
      #   for: 0m
      #   labels:
      #     severity: warning
      #   annotations:
      #     summary: Host context switching high (instance {{ $labels.instance }})
      #     description: "Context switching is growing on the node (twice the daily average during the last 15m)\n  VALUE = {{ $value }}"

  - name: node-exporter-physical
    rules:
      - alert: HostNodeOvertemperatureAlarm
        expr: ((node_hwmon_temp_crit_alarm_celsius == 1) or (node_hwmon_temp_alarm == 1)) * on(instance) group_left (nodename) node_uname_info{nodename=~".+"}
        for: 0m
        labels:
          severity: critical
        annotations:
          summary: Host node overtemperature alarm (instance {{ $labels.instance }})
          description: "Physical node temperature alarm triggered\n  VALUE = {{ $value }}"
      - alert: HostKernelVersionDeviations
        expr: (count(sum(label_replace(node_uname_info, "kernel", "$1", "release", "([0-9]+.[0-9]+.[0-9]+).*")) by (kernel)) > 1) * on(instance) group_left (nodename) node_uname_info{nodename=~".+"}
        for: 6h
        labels:
          severity: warning
        annotations:
          summary: Host kernel version deviations (instance {{ $labels.instance }})
          description: "Different kernel versions are running\n  VALUE = {{ $value }}"

  - name: node-exporter-misc
    rules:
      - alert: HostSystemdServiceCrashed
        expr: (node_systemd_unit_state{state="failed"} == 1) * on(instance) group_left (nodename) node_uname_info{nodename=~".+"}
        for: 0m
        labels:
          severity: warning
        annotations:
          summary: Host systemd service crashed (instance {{ $labels.instance }})
          description: "systemd service crashed\n  VALUE = {{ $value }}"
      - alert: HostPhysicalComponentTooHot
        expr: ((node_hwmon_temp_celsius * ignoring(label) group_left(instance, job, node, sensor) node_hwmon_sensor_label{label!="tctl"} > 75)) * on(instance) group_left (nodename) node_uname_info{nodename=~".+"}
        for: 5m
        labels:
          severity: warning
        annotations:
          summary: Host physical component too hot (instance {{ $labels.instance }})
          description: "Physical hardware component too hot\n  VALUE = {{ $value }}"
      - alert: HostClockSkew
        expr: ((node_timex_offset_seconds > 0.05 and deriv(node_timex_offset_seconds[5m]) >= 0) or (node_timex_offset_seconds < -0.05 and deriv(node_timex_offset_seconds[5m]) <= 0)) * on(instance) group_left (nodename) node_uname_info{nodename=~".+"}
        for: 10m
        labels:
          severity: warning
        annotations:
          summary: Host clock skew (instance {{ $labels.instance }})
          description: "Clock skew detected. Clock is out of sync. Ensure NTP is configured correctly on this host.\n  VALUE = {{ $value }}"
      - alert: HostClockNotSynchronising
        expr: (min_over_time(node_timex_sync_status[1m]) == 0 and node_timex_maxerror_seconds >= 16) * on(instance) group_left (nodename) node_uname_info{nodename=~".+"}
        for: 2m
        labels:
          severity: warning
        annotations:
          summary: Host clock not synchronising (instance {{ $labels.instance }})
          description: "Clock not synchronising. Ensure NTP is configured on this host.\n  VALUE = {{ $value }}"
      - alert: HostRequiresReboot
        expr: (node_reboot_required > 0) * on(instance) group_left (nodename) node_uname_info{nodename=~".+"}
        for: 4h
        labels:
          severity: info
        annotations:
          summary: Host requires reboot (instance {{ $labels.instance }})
          description: "{{ $labels.instance }} requires a reboot.\n  VALUE = {{ $value }}"

  - name: prometheus
    rules:
      - alert: PrometheusJobMissing
        expr: absent(up{job="prometheus"})
        for: 0m
        labels:
          severity: warning
        annotations:
          summary: Prometheus job missing (instance {{ $labels.instance }})
          description: "A Prometheus job has disappeared\n  VALUE = {{ $value }}"
      - alert: PrometheusTargetMissing
        expr: up == 0
        for: 0m
        labels:
          severity: critical
        annotations:
          summary: Prometheus target missing (instance {{ $labels.instance }})
          description: "A Prometheus target has disappeared. An exporter might be crashed.\n  VALUE = {{ $value }}"
      - alert: PrometheusAllTargetsMissing
        expr: sum by (job) (up) == 0
        for: 0m
        labels:
          severity: critical
        annotations:
          summary: Prometheus all targets missing (instance {{ $labels.instance }})
          description: "A Prometheus job does not have living target anymore.\n  VALUE = {{ $value }}"
      - alert: PrometheusConfigurationReloadFailure
        expr: prometheus_config_last_reload_successful != 1
        for: 0m
        labels:
          severity: warning
        annotations:
          summary: Prometheus configuration reload failure (instance {{ $labels.instance }})
          description: "Prometheus configuration reload error\n  VALUE = {{ $value }}"
      - alert: PrometheusTooManyRestarts
        expr: changes(process_start_time_seconds{job=~"prometheus|pushgateway|alertmanager"}[15m]) > 2
        for: 0m
        labels:
          severity: warning
        annotations:
          summary: Prometheus too many restarts (instance {{ $labels.instance }})
          description: "Prometheus has restarted more than twice in the last 15 minutes. It might be crashlooping.\n  VALUE = {{ $value }}"
      - alert: PrometheusAlertmanagerJobMissing
        expr: absent(up{job="alertmanager"})
        for: 0m
        labels:
          severity: warning
        annotations:
          summary: Prometheus AlertManager job missing (instance {{ $labels.instance }})
          description: "A Prometheus AlertManager job has disappeared\n  VALUE = {{ $value }}"
      - alert: PrometheusAlertmanagerConfigurationReloadFailure
        expr: alertmanager_config_last_reload_successful != 1
        for: 0m
        labels:
          severity: warning
        annotations:
          summary: Prometheus AlertManager configuration reload failure (instance {{ $labels.instance }})
          description: "AlertManager configuration reload error\n  VALUE = {{ $value }}"
      - alert: PrometheusAlertmanagerConfigNotSynced
        expr: count(count_values("config_hash", alertmanager_config_hash)) > 1
        for: 0m
        labels:
          severity: warning
        annotations:
          summary: Prometheus AlertManager config not synced (instance {{ $labels.instance }})
          description: "Configurations of AlertManager cluster instances are out of sync\n  VALUE = {{ $value }}"
      # For testing.
      # - alert: PrometheusAlertmanagerE2eDeadManSwitch
      #   expr: vector(1)
      #   for: 0m
      #   labels:
      #     severity: critical
      #   annotations:
      #     summary: Prometheus AlertManager E2E dead man switch (instance {{ $labels.instance }})
      #     description: "Prometheus DeadManSwitch is an always-firing alert. It's used as an end-to-end test of Prometheus through the Alertmanager.\n  VALUE = {{ $value }}"
      - alert: PrometheusNotConnectedToAlertmanager
        expr: prometheus_notifications_alertmanagers_discovered < 1
        for: 0m
        labels:
          severity: critical
        annotations:
          summary: Prometheus not connected to alertmanager (instance {{ $labels.instance }})
          description: "Prometheus cannot connect the alertmanager\n  VALUE = {{ $value }}"
      - alert: PrometheusRuleEvaluationFailures
        expr: increase(prometheus_rule_evaluation_failures_total[3m]) > 0
        for: 0m
        labels:
          severity: critical
        annotations:
          summary: Prometheus rule evaluation failures (instance {{ $labels.instance }})
          description: "Prometheus encountered {{ $value }} rule evaluation failures, leading to potentially ignored alerts.\n  VALUE = {{ $value }}"
      - alert: PrometheusTemplateTextExpansionFailures
        expr: increase(prometheus_template_text_expansion_failures_total[3m]) > 0
        for: 0m
        labels:
          severity: critical
        annotations:
          summary: Prometheus template text expansion failures (instance {{ $labels.instance }})
          description: "Prometheus encountered {{ $value }} template text expansion failures\n  VALUE = {{ $value }}"
      - alert: PrometheusRuleEvaluationSlow
        expr: prometheus_rule_group_last_duration_seconds > prometheus_rule_group_interval_seconds
        for: 5m
        labels:
          severity: warning
        annotations:
          summary: Prometheus rule evaluation slow (instance {{ $labels.instance }})
          description: "Prometheus rule evaluation took more time than the scheduled interval. It indicates a slower storage backend access or too complex query.\n  VALUE = {{ $value }}"
      - alert: PrometheusNotificationsBacklog
        expr: min_over_time(prometheus_notifications_queue_length[10m]) > 0
        for: 0m
        labels:
          severity: warning
        annotations:
          summary: Prometheus notifications backlog (instance {{ $labels.instance }})
          description: "The Prometheus notification queue has not been empty for 10 minutes\n  VALUE = {{ $value }}"
      - alert: PrometheusAlertmanagerNotificationFailing
        expr: rate(alertmanager_notifications_failed_total[1m]) > 0
        for: 0m
        labels:
          severity: critical
        annotations:
          summary: Prometheus AlertManager notification failing (instance {{ $labels.instance }})
          description: "Alertmanager is failing sending notifications\n  VALUE = {{ $value }}"
      - alert: PrometheusTargetEmpty
        expr: prometheus_sd_discovered_targets == 0
        for: 0m
        labels:
          severity: critical
        annotations:
          summary: Prometheus target empty (instance {{ $labels.instance }})
          description: "Prometheus has no target in service discovery\n  VALUE = {{ $value }}"
      - alert: PrometheusTargetScrapingSlow
        expr: prometheus_target_interval_length_seconds{quantile="0.9"} / on (interval, instance, job) prometheus_target_interval_length_seconds{quantile="0.5"} > 1.05
        for: 5m
        labels:
          severity: warning
        annotations:
          summary: Prometheus target scraping slow (instance {{ $labels.instance }})
          description: "Prometheus is scraping exporters slowly since it exceeded the requested interval time. Your Prometheus server is under-provisioned.\n  VALUE = {{ $value }}"
      - alert: PrometheusLargeScrape
        expr: increase(prometheus_target_scrapes_exceeded_sample_limit_total[10m]) > 10
        for: 5m
        labels:
          severity: warning
        annotations:
          summary: Prometheus large scrape (instance {{ $labels.instance }})
          description: "Prometheus has many scrapes that exceed the sample limit\n  VALUE = {{ $value }}"
      - alert: PrometheusTargetScrapeDuplicate
        expr: increase(prometheus_target_scrapes_sample_duplicate_timestamp_total[5m]) > 0
        for: 0m
        labels:
          severity: warning
        annotations:
          summary: Prometheus target scrape duplicate (instance {{ $labels.instance }})
          description: "Prometheus has many samples rejected due to duplicate timestamps but different values\n  VALUE = {{ $value }}"
      - alert: PrometheusTsdbCheckpointCreationFailures
        expr: increase(prometheus_tsdb_checkpoint_creations_failed_total[1m]) > 0
        for: 0m
        labels:
          severity: critical
        annotations:
          summary: Prometheus TSDB checkpoint creation failures (instance {{ $labels.instance }})
          description: "Prometheus encountered {{ $value }} checkpoint creation failures\n  VALUE = {{ $value }}"
      - alert: PrometheusTsdbCheckpointDeletionFailures
        expr: increase(prometheus_tsdb_checkpoint_deletions_failed_total[1m]) > 0
        for: 0m
        labels:
          severity: critical
        annotations:
          summary: Prometheus TSDB checkpoint deletion failures (instance {{ $labels.instance }})
          description: "Prometheus encountered {{ $value }} checkpoint deletion failures\n  VALUE = {{ $value }}"
      - alert: PrometheusTsdbCompactionsFailed
        expr: increase(prometheus_tsdb_compactions_failed_total[1m]) > 0
        for: 0m
        labels:
          severity: critical
        annotations:
          summary: Prometheus TSDB compactions failed (instance {{ $labels.instance }})
          description: "Prometheus encountered {{ $value }} TSDB compactions failures\n  VALUE = {{ $value }}"
      - alert: PrometheusTsdbHeadTruncationsFailed
        expr: increase(prometheus_tsdb_head_truncations_failed_total[1m]) > 0
        for: 0m
        labels:
          severity: critical
        annotations:
          summary: Prometheus TSDB head truncations failed (instance {{ $labels.instance }})
          description: "Prometheus encountered {{ $value }} TSDB head truncation failures\n  VALUE = {{ $value }}"
      - alert: PrometheusTsdbReloadFailures
        expr: increase(prometheus_tsdb_reloads_failures_total[1m]) > 0
        for: 0m
        labels:
          severity: critical
        annotations:
          summary: Prometheus TSDB reload failures (instance {{ $labels.instance }})
          description: "Prometheus encountered {{ $value }} TSDB reload failures\n  VALUE = {{ $value }}"
      - alert: PrometheusTsdbWalCorruptions
        expr: increase(prometheus_tsdb_wal_corruptions_total[1m]) > 0
        for: 0m
        labels:
          severity: critical
        annotations:
          summary: Prometheus TSDB WAL corruptions (instance {{ $labels.instance }})
          description: "Prometheus encountered {{ $value }} TSDB WAL corruptions\n  VALUE = {{ $value }}"
      - alert: PrometheusTsdbWalTruncationsFailed
        expr: increase(prometheus_tsdb_wal_truncations_failed_total[1m]) > 0
        for: 0m
        labels:
          severity: critical
        annotations:
          summary: Prometheus TSDB WAL truncations failed (instance {{ $labels.instance }})
          description: "Prometheus encountered {{ $value }} TSDB WAL truncation failures\n  VALUE = {{ $value }}"
      - alert: PrometheusTimeseriesCardinality
        expr: label_replace(count by(__name__) ({__name__=~".+"}), "name", "$1", "__name__", "(.+)") > 10000
        for: 0m
        labels:
          severity: warning
        annotations:
          summary: Prometheus timeseries cardinality (instance {{ $labels.instance }})
          description: "The \"{{ $labels.name }}\" timeseries cardinality is getting very high: {{ $value }}\n  VALUE = {{ $value }}"