Merge branch 'topic/prometheus'

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diff --git a/roles/monitoring/prometheus/server/defaults/main/rules_node.yml b/roles/monitoring/prometheus/server/defaults/main/rules_node.yml
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+++ b/roles/monitoring/prometheus/server/defaults/main/rules_node.yml
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+---
+## https://awesome-prometheus-alerts.grep.to/rules#host-and-hardware
+prometheus_server_rules_node_extra: []
+prometheus_server_rules_node:
+  - 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)\n  VALUE = {{ '{{' }} $value {{ '}}' }}\n  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\n  VALUE = {{ '{{' }} $value {{ '}}' }}\n  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)\n  VALUE = {{ '{{' }} $value {{ '}}' }}\n  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\n  VALUE = {{ '{{' }} $value {{ '}}' }}\n  LABELS = {{ '{{' }} $labels {{ '}}' }}"
+
+  - alert: HostOutOfInodes
+    expr: node_filesystem_files_free{mountpoint ="/rootfs"} / node_filesystem_files{mountpoint="/rootfs"} * 100 < 10 and ON (instance, device, mountpoint) node_filesystem_readonly{mountpoint="/rootfs"} == 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)\n  VALUE = {{ '{{' }} $value {{ '}}' }}\n  LABELS = {{ '{{' }} $labels {{ '}}' }}"
+
+  - 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 {{ '}}' }}"
+
+  - 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: 100 - (avg by(instance) (rate(node_cpu_seconds_total{mode="idle"}[2m])) * 100) > 80
+    for: 0m
+    labels:
+      severity: warning
+    annotations:
+      summary: Host high CPU load (instance {{ '{{' }} $labels.instance {{ '}}' }})
+      description: "CPU load is > 80%\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: 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 > 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 {{ '}}' }}"
+
+  - 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 {{ '}}' }}"
+
+  - 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 {{ '}}' }}"
+
+  - 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 {{ '}}' }}"
+
+  - 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 five 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 five minutes.\n  VALUE = {{ '{{' }} $value {{ '}}' }}\n  LABELS = {{ '{{' }} $labels {{ '}}' }}"
+
+  - 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
+    for: 1m
+    labels:
+      severity: warning
+    annotations:
+      summary: Host Network Interface Saturated (instance {{ '{{' }} $labels.instance {{ '}}' }})
+      description: "The network interface \"{{ '{{' }} $labels.interface {{ '}}' }}\" on \"{{ '{{' }} $labels.instance {{ '}}' }}\" is getting overloaded.\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 approching 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: 2m
+    labels:
+      severity: warning
+    annotations:
+      summary: Host clock skew (instance {{ '{{' }} $labels.instance {{ '}}' }})
+      description: "Clock skew detected. Clock is out of sync.\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.\n  VALUE = {{ '{{' }} $value {{ '}}' }}\n  LABELS = {{ '{{' }} $labels {{ '}}' }}"