---
groups:
  - name: Node

    rules:
      - alert: HostOutOfMemory
        expr: >-
          node_memory_MemAvailable_bytes
          /
          node_memory_MemTotal_bytes * 100
          < 10
        for: 2m
        labels:
          severity: warning
        annotations:
          summary: Host out of memory (instance {{ $labels.instance }})
          description: |-
            Node memory is filling up (< 10% left).

              VALUE = {{ $value }}
              LABELS = {{ $labels }}

      - 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.

              VALUE = {{ $value }}
              LABELS = {{ $labels }}

      - alert: HostUnusualNetworkThroughputIn
        expr: >-
          sum by (instance) (rate(node_network_receive_bytes_total[2m]))
          / 1024
          / 1024
          > 100
        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).

              VALUE = {{ $value }}
              LABELS = {{ $labels }}

      - alert: HostUnusualNetworkThroughputOut
        expr: >-
          sum by (instance) (rate(node_network_transmit_bytes_total[2m]))
          / 1024
          / 1024
          > 100
        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).

              VALUE = {{ $value }}
              LABELS = {{ $labels }}

      - alert: HostUnusualDiskReadRate
        expr: >-
          sum by (instance) (rate(node_disk_read_bytes_total[2m]))
          / 1024
          / 1024
          > 50
        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).

              VALUE = {{ $value }}
              LABELS = {{ $labels }}

      - alert: HostUnusualDiskWriteRate
        expr: >-
          sum by (instance) (rate(node_disk_written_bytes_total[2m]))
          / 1024
          / 1024
          > 50
        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).

              VALUE = {{ $value }}
              LABELS = {{ $labels }}

      - alert: HostOutOfDiskSpace
        expr: >-
          (node_filesystem_avail_bytes * 100)
          / node_filesystem_size_bytes
          < 10
          and
          ON (instance, device, mountpoint) node_filesystem_readonly
          == 0
        for: 2m
        labels:
          severity: warning
        annotations:
          summary: Host out of disk space (instance {{ $labels.instance }})
          description: |-
            Disk is almost full (< 10% left).

              VALUE = {{ $value }}
              LABELS = {{ $labels }}

      - 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.

              VALUE = {{ $value }}
              LABELS = {{ $labels }}

      - alert: HostOutOfInodes
        expr: >-
          node_filesystem_files_free
          / node_filesystem_files * 100
          < 10
          and
          ON (instance, device, mountpoint) node_filesystem_readonly
          == 0
        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).

              VALUE = {{ $value }}
              LABELS = {{ $labels }}

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

              VALUE = {{ $value }}
              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).

              VALUE = {{ $value }}
              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).

              VALUE = {{ $value }}
              LABELS = {{ $labels }}

      - alert: HostHighCpuLoad
        expr: >-
          sum by (instance)
            (avg by (mode, instance)
              (rate(node_cpu_seconds_total{mode!="idle"}[2m])))
          > 0.8
        for: 0m
        labels:
          severity: warning
        annotations:
          summary: Host high CPU load (instance {{ $labels.instance }})
          description: |-
            CPU load is > 80%.

              VALUE = {{ $value }}
              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.

              VALUE = {{ $value }}
              LABELS = {{ $labels }}

      - alert: HostCpuHighIowait
        expr: |-
          avg by (instance) (rate(node_cpu_seconds_total{mode="iowait"}[5m]))
          * 100
          > 10
        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.

              VALUE = {{ $value }}
              LABELS = {{ $labels }}

      - alert: HostUnusualDiskIo
        expr: >-
          rate(node_disk_io_time_seconds_total[1m]) > 0.5
        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.

              VALUE = {{ $value }}
              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%).

              VALUE = {{ $value }}
              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.

              VALUE = {{ $value }}
              LABELS = {{ $labels }}

      - 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.

              VALUE = {{ $value }}
              LABELS = {{ $labels }}

      - 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.

              VALUE = {{ $value }}
              LABELS = {{ $labels }}

      - 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.

              VALUE = {{ $value }}
              LABELS = {{ $labels }}

      - 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.

              VALUE = {{ $value }}
              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.

              VALUE = {{ $value }}
              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.

              VALUE = {{ $value }}
              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.

              VALUE = {{ $value }}
              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.

              VALUE = {{ $value }}
              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.

              VALUE = {{ $value }}
              LABELS = {{ $labels }}

      - alert: HostNetworkInterfaceSaturated
        expr: >-
          (
            rate(node_network_receive_bytes_total{device!~"^tap.*|^vnet.*|^veth.*|^tun.*"}[1m])
            +
            rate(node_network_transmit_bytes_total{device!~"^tap.*|^vnet.*|^veth.*|^tun.*"}[1m])
          )
          / node_network_speed_bytes{device!~"^tap.*|^vnet.*|^veth.*|^tun.*"}
          > 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.

              VALUE = {{ $value }}
              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 }}".

              VALUE = {{ $value }}
              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.

              VALUE = {{ $value }}
              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: 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.

              VALUE = {{ $value }}
              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.

              VALUE = {{ $value }}
              LABELS = {{ $labels }}

      - alert: HostRequiresReboot
        expr: >-
          node_reboot_required > 0
        for: 4h
        labels:
          severity: info
        annotations:
          summary: Host requires reboot (instance {{ $labels.instance }})
          description: |-
            Instance {{ $labels.instance }} requires a reboot.

              VALUE = {{ $value }}
              LABELS = {{ $labels }}