---
conf:
  prometheus:
    rules:
      nodes:
        groups:
        - name: node.recording_rules
          rules:
          - record: node_filesystem_free_percent
            expr: 100 * {fstype =~ "xfs|ext[34]"} / node_filesystem_size{fstype =~ "xfs|ext[34]"}
          - record: node_ram_usage_percent
            expr: 100 * (node_memory_MemFree + node_memory_Buffers + node_memory_Cached) / node_memory_MemTotal
          - record: node_swap_usage_percent
            expr: 100 * (node_memory_SwapFree + node_memory_SwapCached) / node_memory_SwapTotal
        - name: nodes.alerting_rules
          rules:
          - alert: prom_exporter_node_unavailable
            expr: avg_over_time(up{job="node-exporter"}[5m]) == 0
            for: 5m
            labels:
              severity: warning
            annotations:
              description: node exporter is not collecting metrics or is not available for past 10 minutes
              title: node exporter is not collecting metrics or is not available
          - alert: node_filesystem_full_80percent
            expr: avg_over_time(node_filesystem_free_percent[2m]) > 80
            for: 5m
            labels:
              severity: page
            annotations:
              description: "{{`{{$labels.alias}} device {{$labels.device}} on {{$labels.mountpoint}} has less than 20% free space left.`}}"
              summary: "{{`{{$labels.alias}}: Filesystem is running out of space soon.`}}"
          - alert: node_filesystem_full_in_4h
            expr: predict_linear(node_filesystem_free{fstype =~ "xfs|ext[34]"}[1h], 4 * 3600) <= 0
            for: 5m
            labels:
              severity: page
            annotations:
              description: "{{`{{$labels.alias}} device {{$labels.device}} on {{$labels.mountpoint}} is running out of space of in approx. 4 hours`}}"
              summary: "{{`{{$labels.alias}}: Filesystem is running out of space in 4 hours.`}}"
          - alert: node_filedescriptors_full_in_3h
            expr: predict_linear(node_filefd_allocated[1h], 3 * 3600) >= node_filefd_maximum
            for: 20m
            labels:
              severity: page
            annotations:
              description: "{{`{{$labels.alias}} is running out of available file descriptors in approx. 3 hours`}}"
              summary: "{{`{{$labels.alias}} is running out of available file descriptors in 3 hours.`}}"
          - alert: node_load1_90percent
            expr: node_load1 / ON(alias) count(node_cpu{mode="system"}) BY (alias) >= 0.9
            for: 1h
            labels:
              severity: page
            annotations:
              description: "{{`{{$labels.alias}} is running with > 90% total load for at least 1h.`}}"
              summary: "{{`{{$labels.alias}}: Running on high load.`}}"
          - alert: node_cpu_util_90percent
            expr: 100 - (avg(irate(node_cpu{mode="idle"}[5m])) BY (alias) * 100) >= 90
            for: 1h
            labels:
              severity: page
            annotations:
              description: "{{`{{$labels.alias}} has total CPU utilization over 90% for at least 1h.`}}"
              summary: "{{`{{$labels.alias}}: High CPU utilization.`}}"
          - alert: node_ram_using_90percent
            expr: avg_over_time(node_ram_usage_percent[2m]) > 90
            for: 30m
            labels:
              severity: page
            annotations:
              description: "{{`{{$labels.alias}} is using at least 90% of its RAM for at least 30 minutes now.`}}"
              summary: "{{`{{$labels.alias}}: Using lots of RAM.`}}"
          - alert: node_swap_using_80percent
            expr: avg_over_time(node_swap_usage_percent[2m]) > 80
            for: 10m
            labels:
              severity: page
            annotations:
              description: "{{`{{$labels.alias}} is using 80% of its swap space for at least 10 minutes now.`}}"
              summary: "{{`{{$labels.alias}}: Running out of swap soon.`}}"
          - alert: node_high_cpu_load
            expr: node_load15 / on(alias) count(node_cpu{mode="system"}) by (alias) >= 0
            for: 1m
            labels:
              severity: warning
            annotations:
              description: "{{`{{$labels.alias}} is running with load15 > 1 for at least 5 minutes: {{$value}}`}}"
              summary: "{{`{{$labels.alias}}: Running on high load: {{$value}}`}}"
          - alert: node_high_memory_load
            expr: avg_over_time(node_ram_usage_percent[2m]) > 85
            for: 1m
            labels:
              severity: warning
            annotations:
              description: "{{`Host memory usage is {{ humanize $value }}%. Reported by instance {{ $labels.instance }} of job {{ $labels.job }}.`}}"
              summary: Server memory is almost full
          - alert: node_high_storage_load
            expr: avg_over_time(node_storage_usage_percent{mountpoint="/"}[2m]) > 85
            for: 30s
            labels:
              severity: warning
            annotations:
              description: "{{`Host storage usage is {{ humanize $value }}%. Reported by instance {{ $labels.instance }} of job {{ $labels.job }}.`}}"
              summary: Server storage is almost full
          - alert: node_high_swap
            expr: (node_memory_SwapTotal - node_memory_SwapFree) < (node_memory_SwapTotal
              * 0.4)
            for: 1m
            labels:
              severity: warning
            annotations:
              description: "{{`Host system has a high swap usage of {{ humanize $value }}. Reported by instance {{ $labels.instance }} of job {{ $labels.job }}.`}}"
              summary: Server has a high swap usage
          - alert: node_high_network_drop_rcv
            expr: node_network_receive_drop{device!="lo"} > 3000
            for: 30s
            labels:
              severity: warning
            annotations:
              description: "{{`Host system has an unusally high drop in network reception ({{ humanize $value }}). Reported by instance {{ $labels.instance }} of job {{ $labels.job }}`}}"
              summary: Server has a high receive drop
          - alert: node_high_network_drop_send
            expr: node_network_transmit_drop{device!="lo"} > 3000
            for: 30s
            labels:
              severity: warning
            annotations:
              description: "{{`Host system has an unusally high drop in network transmission ({{ humanize $value }}). Reported by instance {{ $labels.instance }} of job {{$labels.job }}`}}"
              summary: Server has a high transmit drop
          - alert: node_high_network_errs_rcv
            expr: node_network_receive_errs{device!="lo"} > 3000
            for: 30s
            labels:
              severity: warning
            annotations:
              description: "{{`Host system has an unusally high error rate in network reception ({{ humanize $value }}). Reported by instance {{ $labels.instance }} of job {{ $labels.job }}`}}"
              summary: Server has unusual high reception errors
          - alert: node_high_network_errs_send
            expr: node_network_transmit_errs{device!="lo"} > 3000
            for: 30s
            labels:
              severity: warning
            annotations:
              description: "{{`Host system has an unusally high error rate in network transmission ({{ humanize $value }}). Reported by instance {{ $labels.instance }} of job {{ $labels.job }}`}}"
              summary: Server has unusual high transmission errors
          - alert: node_network_conntrack_usage_80percent
            expr: sort(node_nf_conntrack_entries{job="node-exporter"} > node_nf_conntrack_entries_limit{job="node-exporter"}  * 0.8)
            for: 5m
            labels:
              severity: page
            annotations:
              description: "{{`{{$labels.instance}} has network conntrack entries of {{ $value }} which is more than 80% of maximum limit`}}"
              summary: "{{`{{$labels.instance}}: available network conntrack entries are low.`}}"
          - alert: node_entropy_available_low
            expr: node_entropy_available_bits < 300
            for: 5m
            labels:
              severity: page
            annotations:
              description: "{{`{{$labels.instance}} has available entropy bits of {{ $value }} which is less than required of 300`}}"
              summary: "{{`{{$labels.instance}}: is low on entropy bits.`}}"
          - alert: node_hwmon_high_cpu_temp
            expr: node_hwmon_temp_crit_celsius*0.9 - node_hwmon_temp_celsius < 0 OR node_hwmon_temp_max_celsius*0.95 - node_hwmon_temp_celsius < 0
            for: 5m
            labels:
              severity: page
            annotations:
              description: "{{`{{$labels.alias}} reports hwmon sensor {{$labels.sensor}}/{{$labels.chip}} temperature value is nearly critical: {{$value}}`}}"
              summary: "{{`{{$labels.alias}}: Sensor {{$labels.sensor}}/{{$labels.chip}} temp is high: {{$value}}`}}"
          - alert: node_vmstat_paging_rate_high
            expr: irate(node_vmstat_pgpgin[5m]) > 80
            for: 5m
            labels:
              severity: page
            annotations:
              description: "{{`{{$labels.alias}} has a memory paging rate of change higher than 80%: {{$value}}`}}"
              summary: "{{`{{$labels.alias}}: memory paging rate is high: {{$value}}`}}"
          - alert: node_xfs_block_allocation_high
            expr: 100*(node_xfs_extent_allocation_blocks_allocated_total{job="node-exporter", instance=~"172.17.0.1.*"} / (node_xfs_extent_allocation_blocks_freed_total{job="node-exporter", instance=~"172.17.0.1.*"} + node_xfs_extent_allocation_blocks_allocated_total{job="node-exporter", instance=~"172.17.0.1.*"})) > 80
            for: 5m
            labels:
              severity: page
            annotations:
              description: "{{`{{$labels.alias}} has xfs allocation blocks higher than 80%: {{$value}}`}}"
              summary: "{{`{{$labels.alias}}: xfs block allocation high: {{$value}}`}}"
          - alert: node_network_bond_slaves_down
            expr: node_net_bonding_slaves - node_net_bonding_slaves_active > 0
            for: 5m
            labels:
              severity: page
            annotations:
              description: "{{`{{ $labels.master }} is missing {{ $value }} slave interface(s).`}}"
              summary: "{{`Instance {{ $labels.instance }}: {{ $labels.master }} missing {{ $value }} slave interface(s)`}}"
          - alert: node_numa_memory_used
            expr: 100*node_memory_numa_MemUsed / node_memory_numa_MemTotal > 80
            for: 5m
            labels:
              severity: page
            annotations:
              description: "{{`{{$labels.alias}} has more than 80% NUMA memory usage: {{ $value }}`}}"
              summary: "{{`{{$labels.alias}}: has high NUMA memory usage: {{$value}}`}}"
          - alert: node_ntp_clock_skew_high
            expr: abs(node_ntp_drift_seconds) > 2
            for: 5m
            labels:
              severity: page
            annotations:
              description: "{{`{{$labels.alias}} has time difference of more than 2 seconds compared to NTP server: {{ $value }}`}}"
              summary: "{{`{{$labels.alias}}: time is skewed by : {{$value}} seconds`}}"
          - alert: node_disk_read_latency
            expr: (rate(node_disk_read_time_ms[5m]) / rate(node_disk_reads_completed[5m])) > 40
            for: 5m
            labels:
              severity: page
            annotations:
              description: "{{`{{$labels.device}} has a high read latency of {{ $value }}`}}"
              summary: "{{`High read latency observed for device {{ $labels.device }}`}}"
          - alert: node_disk_write_latency
            expr: (rate(node_disk_write_time_ms[5m]) / rate(node_disk_writes_completed[5m])) > 40
            for: 5m
            labels:
              severity: page
            annotations:
              description: "{{`{{$labels.device}} has a high write latency of {{ $value }}`}}"
              summary: "{{`High write latency observed for device {{ $labels.device }}`}}"
...