monitoring/conf/prometheus/alerts/node-exporter.yml

groups:

- name: NodeExporter

  rules:

    - alert: HostOutOfMemory
      expr: '(node_memory_MemAvailable_bytes / node_memory_MemTotal_bytes < .10)'
      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 }}\n  LABELS = {{ $labels }}"

    - alert: HostMemoryUnderMemoryPressure
      expr: '(rate(node_vmstat_pgmajfault[5m]) > 1000)'
      for: 0m
      labels:
        severity: warning
      annotations:
        summary: Host memory under memory pressure (instance {{ $labels.instance }})
        description: "The node is under heavy memory pressure. High rate of loading memory pages from disk.\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

    - alert: HostMemoryIsUnderutilized
      expr: 'min_over_time(node_memory_MemFree_bytes[1w]) > node_memory_MemTotal_bytes * .8'
      for: 0m
      labels:
        severity: info
      annotations:
        summary: Host Memory is underutilized (instance {{ $labels.instance }})
        description: "Node memory usage is < 20% for 1 week. Consider reducing memory space. (instance {{ $labels.instance }})\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

    - alert: HostUnusualNetworkThroughputIn
      expr: '((rate(node_network_receive_bytes_total[5m]) / on(instance, device) node_network_speed_bytes) > .80)'
      for: 0m
      labels:
        severity: warning
      annotations:
        summary: Host unusual network throughput in (instance {{ $labels.instance }})
        description: "Host receive bandwidth is high (>80%)\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

    - alert: HostUnusualNetworkThroughputOut
      expr: '((rate(node_network_transmit_bytes_total[5m]) / on(instance, device) node_network_speed_bytes) > .80)'
      for: 0m
      labels:
        severity: warning
      annotations:
        summary: Host unusual network throughput out (instance {{ $labels.instance }})
        description: "Host transmit bandwidth is high (>80%)\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

    - alert: HostUnusualDiskReadRate
      expr: '(rate(node_disk_io_time_seconds_total[5m]) > .80)'
      for: 0m
      labels:
        severity: warning
      annotations:
        summary: Host unusual disk read rate (instance {{ $labels.instance }})
        description: "Disk is too busy (IO wait > 80%)\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

    - alert: HostOutOfDiskSpace
      expr: '(node_filesystem_avail_bytes{fstype!~"^(fuse.*|tmpfs|cifs|nfs)"} / node_filesystem_size_bytes < .10 and on (instance, device, mountpoint) node_filesystem_readonly == 0)'
      for: 2m
      labels:
        severity: critical
      annotations:
        summary: Host out of disk space (instance {{ $labels.instance }})
        description: "Disk is almost full (< 10% left)\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

    - alert: HostDiskMayFillIn24Hours
      expr: 'predict_linear(node_filesystem_avail_bytes{fstype!~"^(fuse.*|tmpfs|cifs|nfs)"}[1h], 86400) <= 0 and node_filesystem_avail_bytes > 0'
      for: 2m
      labels:
        severity: warning
      annotations:
        summary: Host disk may fill in 24 hours (instance {{ $labels.instance }})
        description: "Filesystem will likely run out of space within the next 24 hours\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

    - alert: HostOutOfInodes
      expr: '(node_filesystem_files_free{fstype!="msdosfs"} / node_filesystem_files{fstype!="msdosfs"} < .10 and ON (instance, device, mountpoint) node_filesystem_readonly == 0)'
      for: 2m
      labels:
        severity: critical
      annotations:
        summary: Host out of inodes (instance {{ $labels.instance }})
        description: "Disk is almost running out of available inodes (< 10% left)\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

    - alert: HostFilesystemDeviceError
      expr: 'node_filesystem_device_error{fstype!~"^(fuse.*|tmpfs|cifs|nfs)"} == 1'
      for: 2m
      labels:
        severity: critical
      annotations:
        summary: Host filesystem device error (instance {{ $labels.instance }})
        description: "Error stat-ing the {{ $labels.mountpoint }} filesystem\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

    - alert: HostInodesWillFillIn24Hours
      expr: 'predict_linear(node_filesystem_files_free{fstype!~"^(fuse.*|tmpfs|cifs|nfs)"}[1h], 86400) <= 0 and node_filesystem_files_free > 0'
      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 }}\n  LABELS = {{ $labels }}"

    - 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)'
      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 }}\n  LABELS = {{ $labels }}"

    - 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)'
      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 }}\n  LABELS = {{ $labels }}"

    - alert: HostHighCpuLoad
      expr: '(avg by (instance) (rate(node_cpu_seconds_total{mode!="idle"}[2m]))) > .80'
      for: 10m
      labels:
        severity: warning
      annotations:
        summary: Host high CPU load (instance {{ $labels.instance }})
        description: "CPU load is > 80%\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

    - alert: HostCpuIsUnderutilized
      expr: '(min by (instance) (rate(node_cpu_seconds_total{mode="idle"}[1h]))) > 0.8'
      for: 1w
      labels:
        severity: info
      annotations:
        summary: Host CPU is underutilized (instance {{ $labels.instance }})
        description: "CPU load has been < 20% for 1 week. Consider reducing the number of CPUs.\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

    - alert: HostCpuStealNoisyNeighbor
      expr: 'avg by(instance) (rate(node_cpu_seconds_total{mode="steal"}[5m])) * 100 > 10'
      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 }}\n  LABELS = {{ $labels }}"

    - alert: HostCpuHighIowait
      expr: 'avg by (instance) (rate(node_cpu_seconds_total{mode="iowait"}[5m])) > .10'
      for: 0m
      labels:
        severity: warning
      annotations:
        summary: Host CPU high iowait (instance {{ $labels.instance }})
        description: "CPU iowait > 10%. Your CPU is idling waiting for storage to respond.\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

    - alert: HostUnusualDiskIo
      expr: 'rate(node_disk_io_time_seconds_total[5m]) > 0.8'
      for: 5m
      labels:
        severity: warning
      annotations:
        summary: Host unusual disk IO (instance {{ $labels.instance }})
        description: "Disk usage >80%. Check storage for issues or increase IOPS capabilities.\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

    - 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 }}\n  LABELS = {{ $labels }}"

    - alert: HostSwapIsFillingUp
      expr: '((1 - (node_memory_SwapFree_bytes / node_memory_SwapTotal_bytes)) * 100 > 80)'
      for: 2m
      labels:
        severity: warning
      annotations:
        summary: Host swap is filling up (instance {{ $labels.instance }})
        description: "Swap is filling up (>80%)\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

    - alert: HostSystemdServiceCrashed
      expr: '(node_systemd_unit_state{state="failed"} == 1)'
      for: 0m
      labels:
        severity: warning
      annotations:
        summary: Host systemd service crashed (instance {{ $labels.instance }})
        description: "systemd service crashed\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

    - alert: HostPhysicalComponentTooHot
      expr: 'node_hwmon_temp_celsius > node_hwmon_temp_max_celsius'
      for: 5m
      labels:
        severity: warning
      annotations:
        summary: Host physical component too hot (instance {{ $labels.instance }})
        description: "Physical hardware component too hot\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

    - 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 }}\n  LABELS = {{ $labels }}"

    - alert: HostSoftwareRaidInsufficientDrives
      expr: '((node_md_disks_required - on(device, instance) node_md_disks{state="active"}) > 0)'
      for: 0m
      labels:
        severity: critical
      annotations:
        summary: Host Software RAID insufficient drives (instance {{ $labels.instance }})
        description: "MD RAID array {{ $labels.device }} on {{ $labels.instance }} has insufficient drives remaining.\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

    - alert: HostSoftwareRaidDiskFailure
      expr: '(node_md_disks{state="failed"} > 0)'
      for: 2m
      labels:
        severity: warning
      annotations:
        summary: Host Software RAID disk failure (instance {{ $labels.instance }})
        description: "MD RAID array {{ $labels.device }} on {{ $labels.instance }} needs attention.\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

    - alert: HostKernelVersionDeviations
      expr: 'changes(node_uname_info[1h]) > 0'
      for: 0m
      labels:
        severity: info
      annotations:
        summary: Host kernel version deviations (instance {{ $labels.instance }})
        description: "Kernel version for {{ $labels.instance }} has changed\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

    - alert: HostOomKillDetected
      expr: '(increase(node_vmstat_oom_kill[1m]) > 0)'
      for: 0m
      labels:
        severity: critical
      annotations:
        summary: Host OOM kill detected (instance {{ $labels.instance }})
        description: "OOM kill detected\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

    - alert: HostEdacCorrectableErrorsDetected
      expr: '(increase(node_edac_correctable_errors_total[1m]) > 0)'
      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 }}\n  LABELS = {{ $labels }}"

    - alert: HostEdacUncorrectableErrorsDetected
      expr: '(node_edac_uncorrectable_errors_total > 0)'
      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 }}\n  LABELS = {{ $labels }}"

    - alert: HostNetworkReceiveErrors
      expr: '(rate(node_network_receive_errs_total[2m]) / rate(node_network_receive_packets_total[2m]) > 0.01)'
      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 }}\n  LABELS = {{ $labels }}"

    - alert: HostNetworkTransmitErrors
      expr: '(rate(node_network_transmit_errs_total[2m]) / rate(node_network_transmit_packets_total[2m]) > 0.01)'
      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 }}\n  LABELS = {{ $labels }}"

    - alert: HostNetworkBondDegraded
      expr: '((node_bonding_active - node_bonding_slaves) != 0)'
      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 }}\n  LABELS = {{ $labels }}"

    - alert: HostConntrackLimit
      expr: '(node_nf_conntrack_entries / node_nf_conntrack_entries_limit > 0.8)'
      for: 5m
      labels:
        severity: warning
      annotations:
        summary: Host conntrack limit (instance {{ $labels.instance }})
        description: "The number of conntrack is approaching limit\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

    - 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))'
      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 }}\n  LABELS = {{ $labels }}"

    - alert: HostClockNotSynchronising
      expr: '(min_over_time(node_timex_sync_status[1m]) == 0 and node_timex_maxerror_seconds >= 16)'
      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 }}\n  LABELS = {{ $labels }}"

    - alert: HostRequiresReboot
      expr: '(node_reboot_required > 0)'
      for: 4h
      labels:
        severity: info
      annotations:
        summary: Host requires reboot (instance {{ $labels.instance }})
        description: "{{ $labels.instance }} requires a reboot.\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"