---
groups:
  - name: Redis

    rules:
      - alert: RedisDown
        expr: >-
          redis_up == 0
        for: 0m
        labels:
          severity: critical
        annotations:
          summary: Redis down at {{ $labels.instance }}.
          description: |-
            Redis instance is down.

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

      - alert: RedisOutOfSystemMemory
        expr: >-
          redis_memory_used_bytes
          /
          redis_total_system_memory_bytes * 100
          > 90
        for: 2m
        labels:
          severity: warning
        annotations:
          summary: Redis out of system memory at {{ $labels.instance }}.
          description: |-
            Redis is running out of system memory.

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

      - alert: RedisOutOfConfiguredMaxmemory
        expr: >-
          redis_memory_max_bytes != 0
          and
          (
            redis_memory_used_bytes
            /
            redis_memory_max_bytes * 100
            > 90
          )
        for: 2m
        labels:
          severity: warning
        annotations:
          summary: Redis out of configured maxmemory at {{ $labels.instance }}.
          description: |-
            Redis is running out of configured maxmemory.

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

      - alert: RedisTooManyConnections
        expr: >-
          redis_connected_clients > 100
        for: 2m
        labels:
          severity: warning
        annotations:
          summary: Redis too many connections at {{ $labels.instance }}.
          description: |-
            Redis instance has too many connections.

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

      - alert: RedisNotEnoughConnections
        expr: >-
          redis_connected_clients < 1
        for: 2m
        labels:
          severity: warning
        annotations:
          summary: Redis not enough connections at {{ $labels.instance }}.
          description: |-
            Redis instance should have more connections.

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

      - alert: RedisRejectedConnections
        expr: >-
          increase(redis_rejected_connections_total[1m]) > 0
        for: 0m
        labels:
          severity: critical
        annotations:
          summary: Redis rejected connections at {{ $labels.instance }}.
          description: |-
            Some connections to Redis have been rejected.

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