---
apiVersion: 1

# Tier 2 — Warning alerts. These send email only (non-paging).
# Datasource UID: bezqqznn81wqof (Prometheus on london-a)
# All alerts use reduce+threshold (not classic_conditions) so $labels.* and $value work in annotations.

groups:
  - orgId: 1
    name: warning-resources
    folder: Alerting
    interval: 2m
    rules:
      - uid: cff6uy23024n4c
        title: Disk Usage Warning (>80%)
        condition: C
        data:
          - refId: A
            datasourceUid: bezqqznn81wqof
            relativeTimeRange:
              from: 600
              to: 0
            model:
              expr: |
                (
                  node_filesystem_size_bytes{job="node_exporter", fstype!~"tmpfs|overlay|squashfs|devtmpfs"}
                  - node_filesystem_avail_bytes{job="node_exporter", fstype!~"tmpfs|overlay|squashfs|devtmpfs"}
                )
                / node_filesystem_size_bytes{job="node_exporter", fstype!~"tmpfs|overlay|squashfs|devtmpfs"}
                * 100
              instant: true
              intervalMs: 1000
              maxDataPoints: 43200
              refId: A
          - refId: B
            datasourceUid: __expr__
            relativeTimeRange:
              from: 0
              to: 0
            model:
              datasource:
                type: __expr__
                uid: __expr__
              expression: A
              reducer: last
              settings:
                mode: ""
              refId: B
              type: reduce
          - refId: C
            datasourceUid: __expr__
            relativeTimeRange:
              from: 0
              to: 0
            model:
              conditions:
                - evaluator:
                    params: [80]
                    type: gt
                  operator:
                    type: and
                  query:
                    params: [C]
                  reducer:
                    params: []
                    type: last
                  type: query
              datasource:
                type: __expr__
                uid: __expr__
              expression: B
              refId: C
              type: threshold
        noDataState: NoData
        execErrState: Error
        for: 10m
        annotations:
          summary: "Disk usage high on {{ $labels.server }}"
          description: "Filesystem {{ $labels.mountpoint }} on {{ $labels.server }} is over 80% full (currently {{ $value | printf \"%.1f\" }}%)."
        labels:
          severity: warning
        isPaused: false

      - uid: dff6uy24szhmod
        title: Memory Usage Warning (>85%)
        condition: C
        data:
          - refId: A
            datasourceUid: bezqqznn81wqof
            relativeTimeRange:
              from: 600
              to: 0
            model:
              expr: |
                (1 - (node_memory_MemAvailable_bytes{job="node_exporter"} / node_memory_MemTotal_bytes{job="node_exporter"})) * 100
              instant: true
              intervalMs: 1000
              maxDataPoints: 43200
              refId: A
          - refId: B
            datasourceUid: __expr__
            relativeTimeRange:
              from: 0
              to: 0
            model:
              datasource:
                type: __expr__
                uid: __expr__
              expression: A
              reducer: last
              settings:
                mode: ""
              refId: B
              type: reduce
          - refId: C
            datasourceUid: __expr__
            relativeTimeRange:
              from: 0
              to: 0
            model:
              conditions:
                - evaluator:
                    params: [85]
                    type: gt
                  operator:
                    type: and
                  query:
                    params: [C]
                  reducer:
                    params: []
                    type: last
                  type: query
              datasource:
                type: __expr__
                uid: __expr__
              expression: B
              refId: C
              type: threshold
        noDataState: NoData
        execErrState: Error
        for: 10m
        annotations:
          summary: "Memory usage high on {{ $labels.server }}"
          description: "Memory usage on {{ $labels.server }} ({{ $labels.instance }}) is above 85% for 10+ minutes."
        labels:
          severity: warning
        isPaused: false

      - uid: cff6uy26jey9sd
        title: CPU Usage High (>85%)
        condition: C
        data:
          - refId: A
            datasourceUid: bezqqznn81wqof
            relativeTimeRange:
              from: 600
              to: 0
            model:
              expr: |
                100 - (avg by (server, instance) (rate(node_cpu_seconds_total{job="node_exporter", mode="idle"}[5m])) * 100)
              instant: true
              intervalMs: 1000
              maxDataPoints: 43200
              refId: A
          - refId: B
            datasourceUid: __expr__
            relativeTimeRange:
              from: 0
              to: 0
            model:
              datasource:
                type: __expr__
                uid: __expr__
              expression: A
              reducer: last
              settings:
                mode: ""
              refId: B
              type: reduce
          - refId: C
            datasourceUid: __expr__
            relativeTimeRange:
              from: 0
              to: 0
            model:
              conditions:
                - evaluator:
                    params: [85]
                    type: gt
                  operator:
                    type: and
                  query:
                    params: [C]
                  reducer:
                    params: []
                    type: last
                  type: query
              datasource:
                type: __expr__
                uid: __expr__
              expression: B
              refId: C
              type: threshold
        noDataState: NoData
        execErrState: Error
        for: 15m
        annotations:
          summary: "CPU usage sustained high on {{ $labels.server }}"
          description: "CPU on {{ $labels.server }} has been above 85% for 15+ minutes (currently {{ $value | printf \"%.1f\" }}%)."
        labels:
          severity: warning
        isPaused: false

      - uid: eff6uy289uewwb
        title: System Load High (>2x CPUs)
        condition: C
        data:
          - refId: A
            datasourceUid: bezqqznn81wqof
            relativeTimeRange:
              from: 600
              to: 0
            model:
              # Compare 15-minute load against number of CPUs
              expr: |
                node_load15{job="node_exporter"} / on(instance) group_left() count by (instance) (node_cpu_seconds_total{job="node_exporter", mode="idle"})
              instant: true
              intervalMs: 1000
              maxDataPoints: 43200
              refId: A
          - refId: B
            datasourceUid: __expr__
            relativeTimeRange:
              from: 0
              to: 0
            model:
              datasource:
                type: __expr__
                uid: __expr__
              expression: A
              reducer: last
              settings:
                mode: ""
              refId: B
              type: reduce
          - refId: C
            datasourceUid: __expr__
            relativeTimeRange:
              from: 0
              to: 0
            model:
              conditions:
                - evaluator:
                    params: [2]
                    type: gt
                  operator:
                    type: and
                  query:
                    params: [C]
                  reducer:
                    params: []
                    type: last
                  type: query
              datasource:
                type: __expr__
                uid: __expr__
              expression: B
              refId: C
              type: threshold
        noDataState: NoData
        execErrState: Error
        for: 15m
        annotations:
          summary: "High system load on {{ $labels.server }}"
          description: "15-minute load average on {{ $labels.server }} is {{ $value | printf \"%.2f\" }}x the CPU count (threshold: 2x)."
        labels:
          severity: warning
        isPaused: false