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 / node_filesystem_files < .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: HostInodesMayFillIn24Hours
        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 may fill in 24 hours (instance {{ $labels.instance }})
          description: "Filesystem will likely 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]))) > 0.95'
        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. Check storage for issues.\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))"
        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: warning
        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 }}"
