groups:
- name: apache-http
  rules:
  - alert: ApacheDown
    annotations:
      description: Apache is down on {{ $labels.instance }}.
      summary: Apache is down.
    expr: apache_up == 0
    for: 5m
    labels:
      severity: warning
  - alert: ApacheRestart
    annotations:
      description: Apache has just been restarted on {{ $labels.instance }}.
      summary: Apache restart.
    expr: apache_uptime_seconds_total / 60 < 1
    for: "0"
    labels:
      severity: info
  - alert: ApacheWorkersLoad
    annotations:
      description: |
        Apache workers in busy state approach the max workers count 80% workers busy on {{ $labels.instance }}.
        The current value is {{ $value }}%.
      summary: Apache workers load is too high.
    expr: |
      (sum by (instance) (apache_workers{state="busy"}) / sum by (instance) (apache_scoreboard) ) * 100 > 80
    for: 15m
    labels:
      severity: warning
  - alert: ApacheResponseTimeTooHigh
    annotations:
      description: |
        Apache average response time is above the threshold of 5000 ms on {{ $labels.instance }}.
        The current value is {{ $value }} ms.
      summary: Apache response time is too high.
    expr: |
      increase(apache_duration_ms_total[5m])/increase(apache_accesses_total[5m]) > 5000
    for: 15m
    labels:
      severity: warning