2 Host node-exporter

2.1 Out of memory

Node memory is filling up (< 10% left)

- alert: OutOfMemory
  expr: node_memory_MemAvailable_bytes / node_memory_MemTotal_bytes * 100 < 10
  for: 5m
  labels:
    severity: warning
  annotations:
    summary: "Out of memory (instance {{ $labels.instance }})"
    description: "Node memory is filling up (< 10% left)\n  VALUE = {{ $value }}\n  LABELS: {{ $labels }}"

2.2. Host memory under memory pressure

The node is under heavy memory pressure. High rate of major page faults

  - alert: HostMemoryUnderMemoryPressure
    expr: rate(node_vmstat_pgmajfault[1m]) > 1000
    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 }}\n  LABELS = {{ $labels }}"

2.3 Unusual network throughput in

Host network interfaces are probably receiving too much data (> 100 MB/s)

- alert: UnusualNetworkThroughputIn
  expr: sum by (instance) (irate(node_network_receive_bytes_total[2m])) / 1024 / 1024 > 100
  for: 5m
  labels:
    severity: warning
  annotations:
    summary: "Unusual network throughput in (instance {{ $labels.instance }})"
    description: "Host network interfaces are probably receiving too much data (> 100 MB/s)\n  VALUE = {{ $value }}\n  LABELS: {{ $labels }}"

2.4. Unusual network throughput out

Host network interfaces are probably sending too much data (> 100 MB/s)

- alert: UnusualNetworkThroughputOut
  expr: sum by (instance) (irate(node_network_transmit_bytes_total[2m])) / 1024 / 1024 > 100
  for: 5m
  labels:
    severity: warning
  annotations:
    summary: "Unusual network throughput out (instance {{ $labels.instance }})"
    description: "Host network interfaces are probably sending too much data (> 100 MB/s)\n  VALUE = {{ $value }}\n  LABELS: {{ $labels }}"

2.5. Unusual disk read rate

Disk is probably reading too much data (> 50 MB/s)

- alert: UnusualDiskReadRate
  expr: sum by (instance) (irate(node_disk_read_bytes_total[2m])) / 1024 / 1024 > 50
  for: 5m
  labels:
    severity: warning
  annotations:
    summary: "Unusual disk read rate (instance {{ $labels.instance }})"
    description: "Disk is probably reading too much data (> 50 MB/s)\n  VALUE = {{ $value }}\n  LABELS: {{ $labels }}"

2.6. Unusual disk write rate

Disk is probably writing too much data (> 50 MB/s)

- alert: UnusualDiskWriteRate
  expr: sum by (instance) (irate(node_disk_written_bytes_total[2m])) / 1024 / 1024 > 50
  for: 5m
  labels:
    severity: warning
  annotations:
    summary: "Unusual disk write rate (instance {{ $labels.instance }})"
    description: "Disk is probably writing too much data (> 50 MB/s)\n  VALUE = {{ $value }}\n  LABELS: {{ $labels }}"

2.7 Out of disk space

Disk is almost full (< 10% left)

- alert: OutOfDiskSpace
  expr: node_filesystem_free_bytes{mountpoint ="/rootfs"} / node_filesystem_size_bytes{mountpoint ="/rootfs"} * 100 < 10
  for: 5m
  labels:
    severity: warning
  annotations:
    summary: "Out of disk space (instance {{ $labels.instance }})"
    description: "Disk is almost full (< 10% left)\n  VALUE = {{ $value }}\n  LABELS: {{ $labels }}"

2.8 Host disk will fill in 24 hours

Filesystem is predicted to run out of space within the next 24 hours at current write rate

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

2.9 Out of inodes

Disk is almost running out of available inodes (< 10% left)

- alert: OutOfInodes
  expr: node_filesystem_files_free{mountpoint ="/rootfs"} / node_filesystem_files{mountpoint ="/rootfs"} * 100 < 10
  for: 5m
  labels:
    severity: warning
  annotations:
    summary: "Out of inodes (instance {{ $labels.instance }})"
    description: "Disk is almost running out of available inodes (< 10% left)\n  VALUE = {{ $value }}\n  LABELS: {{ $labels }}"

2.10. Host inodes will fill in 24 hours

Filesystem is predicted to run out of inodes within the next 24 hours at current write rate

  - alert: HostInodesWillFillIn24Hours
    expr: node_filesystem_files_free{mountpoint ="/rootfs"} / node_filesystem_files{mountpoint="/rootfs"} * 100 < 10 and predict_linear(node_filesystem_files_free{mountpoint="/rootfs"}[1h], 24 * 3600) < 0 and ON (instance, device, mountpoint) node_filesystem_readonly{mountpoint="/rootfs"} == 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 }}"

2.11 Unusual disk read latency

Disk latency is growing (read operations > 100ms)

- alert: UnusualDiskReadLatency
  expr: rate(node_disk_read_time_seconds_total[1m]) / rate(node_disk_reads_completed_total[1m]) > 100
  for: 5m
  labels:
    severity: warning
  annotations:
    summary: "Unusual disk read latency (instance {{ $labels.instance }})"
    description: "Disk latency is growing (read operations > 100ms)\n  VALUE = {{ $value }}\n  LABELS: {{ $labels }}"

2.12 Unusual disk write latency

Disk latency is growing (write operations > 100ms)

- alert: UnusualDiskWriteLatency
  expr: rate(node_disk_write_time_seconds_total[1m]) / rate(node_disk_writes_completed_total[1m]) > 100
  for: 5m
  labels:
    severity: warning
  annotations:
    summary: "Unusual disk write latency (instance {{ $labels.instance }})"
    description: "Disk latency is growing (write operations > 100ms)\n  VALUE = {{ $value }}\n  LABELS: {{ $labels }}"

2.13 High CPU load

CPU load is > 80%

- alert: HighCpuLoad
  expr: 100 - (avg by(instance) (irate(node_cpu_seconds_total{mode="idle"}[5m])) * 100) > 80
  for: 5m
  labels:
    severity: warning
  annotations:
    summary: "High CPU load (instance {{ $labels.instance }})"
    description: "CPU load is > 80%\n  VALUE = {{ $value }}\n  LABELS: {{ $labels }}"

2.14. Host CPU steal noisy neighbor

CPU steal is > 10%. A noisy neighbor is killing VM performances or a spot instance may be out of credit.

  - 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 }}"

2.15 Host Context switching

Context switching is growing on node (> 1000 / s)

# 1000 context switches is an arbitrary number.
# Alert threshold depends on nature of application.
# Please read: https://github.com/samber/awesome-prometheus-alerts/issues/58

- alert: ContextSwitching
  expr: rate(node_context_switches_total[5m]) > 1000
  for: 5m
  labels:
    severity: warning
  annotations:
    summary: "Context switching (instance {{ $labels.instance }})"
    description: "Context switching is growing on node (> 1000 / s)\n  VALUE = {{ $value }}\n  LABELS: {{ $labels }}"

2.16 Swap is filling up

Swap is filling up (>80%)

- alert: SwapIsFillingUp
  expr: (1 - (node_memory_SwapFree_bytes / node_memory_SwapTotal_bytes)) * 100 > 80
  for: 5m
  labels:
    severity: warning
  annotations:
    summary: "Swap is filling up (instance {{ $labels.instance }})"
    description: "Swap is filling up (>80%)\n  VALUE = {{ $value }}\n  LABELS: {{ $labels }}"

2.17 Host Systemd service crashed

SystemD service crashed

- alert: SystemdServiceCrashed
  expr: node_systemd_unit_state{state="failed"} == 1
  for: 5m
  labels:
    severity: warning
  annotations:
    summary: "SystemD service crashed (instance {{ $labels.instance }})"
    description: "SystemD service crashed\n  VALUE = {{ $value }}\n  LABELS: {{ $labels }}"

2.18. Host physical component too hot

Physical hardware component too hot

  - alert: HostPhysicalComponentTooHot
    expr: node_hwmon_temp_celsius > 75
    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 }}"

2.19. Host node overtemperature alarm

Physical node temperature alarm triggered

  - alert: HostNodeOvertemperatureAlarm
    expr: node_hwmon_temp_crit_alarm_celsius == 1
    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 }}"

2.20. Host RAID array got inactive

RAID array {{ $labels.device }} is in degraded state due to one or more disks failures. Number of spare drives is insufficient to fix issue automatically.

  - alert: HostRaidArrayGotInactive
    expr: node_md_state{state="inactive"} > 0
    for: 0m
    labels:
      severity: critical
    annotations:
      summary: Host RAID array got inactive (instance {{ $labels.instance }})
      description: "RAID array {{ $labels.device }} is in degraded state due to one or more disks failures. Number of spare drives is insufficient to fix issue automatically.\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

2.21. Host RAID disk failure

At least one device in RAID array on {{ $labels.instance }} failed. Array {{ $labels.md_device }} needs attention and possibly a disk swap

  - alert: HostRaidDiskFailure
    expr: node_md_disks{state="failed"} > 0
    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 }}\n  LABELS = {{ $labels }}"

2.22. Host kernel version deviations

Different kernel versions are running

  - alert: HostKernelVersionDeviations
    expr: count(sum(label_replace(node_uname_info, "kernel", "$1", "release", "([0-9]+.[0-9]+.[0-9]+).*")) by (kernel)) > 1
    for: 6h
    labels:
      severity: warning
    annotations:
      summary: Host kernel version deviations (instance {{ $labels.instance }})
      description: "Different kernel versions are running\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

2.23. Host OOM kill detected

OOM kill detected

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

2.24. Host EDAC Correctable Errors detected

Host {{ $labels.instance }} has had {{ printf "%.0f" $value }} correctable memory errors reported by EDAC in the last 5 minutes.

  - 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 }}"

2.25. Host EDAC Uncorrectable Errors detected

Host {{ $labels.instance }} has had {{ printf "%.0f" $value }} correctable memory errors reported by EDAC in the last 5 minutes.

  - 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 }}"

2.26. Host Network Receive Errors

Host {{ $labels.instance }} interface {{ $labels.device }} has encountered {{ printf "%.0f" $value }} receive errors in the last two minutes.

  - 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 }}"

2.27. Host Network Transmit Errors

Host {{ $labels.instance }} interface {{ $labels.device }} has encountered {{ printf "%.0f" $value }} transmit errors in the last two minutes.

  - 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 }}"

2.28. Host Network Interface Saturated

The network interface "{{ $labels.device }}" on "{{ $labels.instance }}" is getting overloaded.

  - alert: HostNetworkInterfaceSaturated
    expr: (rate(node_network_receive_bytes_total{device!~"^tap.*"}[1m]) + rate(node_network_transmit_bytes_total{device!~"^tap.*"}[1m])) / node_network_speed_bytes{device!~"^tap.*"} > 0.8 < 10000
    for: 1m
    labels:
      severity: warning
    annotations:
      summary: Host Network Interface Saturated (instance {{ $labels.instance }})
      description: "The network interface \"{{ $labels.device }}\" on \"{{ $labels.instance }}\" is getting overloaded.\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

2.29. Host Network Bond Degraded

Bond "{{ $labels.device }}" degraded on "{{ $labels.instance }}".

  - 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 }}"

2.30. Host conntrack limit

The number of conntrack is approaching limit

  - 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 }}"

2.31. Host clock skew

Clock skew detected. Clock is out of sync. Ensure NTP is configured correctly on this host.

  - 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: 2m
    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 }}"

2.32. Host clock not synchronising

Clock not synchronising. Ensure NTP is configured on this host.

  - 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 }}"

2.33. Host requires reboot

{{ $labels.instance }} requires a reboot.

  - 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 }}"