groups:

- name: 

  rules:

    - alert: CaddyReverseProxyDown
      expr: 'count(caddy_reverse_proxy_upstreams_healthy) by (upstream) == 0'
      for: 0m
      labels:
        severity: critical
      annotations:
        summary: Caddy Reverse Proxy Down (instance {{ $labels.instance }})
        description: "All Caddy reverse proxies are down\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

    - alert: CaddyHighHttp4xxErrorRateService
      expr: 'sum(rate(caddy_http_request_duration_seconds_count{code=~"4.."}[3m])) by (instance) / sum(rate(caddy_http_request_duration_seconds_count[3m])) by (instance) * 100 > 5'
      for: 1m
      labels:
        severity: critical
      annotations:
        summary: Caddy high HTTP 4xx error rate service (instance {{ $labels.instance }})
        description: "Caddy service 4xx error rate is above 5%\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"

    - alert: CaddyHighHttp5xxErrorRateService
      expr: 'sum(rate(caddy_http_request_duration_seconds_count{code=~"5.."}[3m])) by (instance) / sum(rate(caddy_http_request_duration_seconds_count[3m])) by (instance) * 100 > 5'
      for: 1m
      labels:
        severity: critical
      annotations:
        summary: Caddy high HTTP 5xx error rate service (instance {{ $labels.instance }})
        description: "Caddy service 5xx error rate is above 5%\n  VALUE = {{ $value }}\n  LABELS = {{ $labels }}"