groups:
  - name: qpc-server
    rules:
      - alert: QpcServerDown
        expr: up{job="qpc-server"} == 0
        for: 1m
        labels:
          severity: critical
        annotations:
          summary: "qpc-server is down"
          description: "Prometheus cannot scrape qpc-server metrics for > 1 minute."

      - alert: QpcHighAuthFailureRate
        expr: rate(auth_login_failure_total[5m]) > 10
        for: 2m
        labels:
          severity: warning
        annotations:
          summary: "High authentication failure rate"
          description: "{{ $value | printf \"%.1f\" }} auth failures/sec over 5 minutes."

      - alert: QpcRateLimitActive
        expr: rate(rate_limit_hit_total[5m]) > 5
        for: 5m
        labels:
          severity: warning
        annotations:
          summary: "Rate limiting is actively rejecting requests"

      - alert: QpcDeliveryQueueHigh
        expr: delivery_queue_depth > 10000
        for: 10m
        labels:
          severity: warning
        annotations:
          summary: "Delivery queue depth is high ({{ $value }})"

      - alert: QpcDeliveryQueueCritical
        expr: delivery_queue_depth > 100000
        for: 5m
        labels:
          severity: critical
        annotations:
          summary: "Delivery queue depth is critical ({{ $value }})"

      - alert: QpcLowAuthSuccessRatio
        expr: >
          rate(auth_login_success_total[5m])
          / (rate(auth_login_success_total[5m]) + rate(auth_login_failure_total[5m]))
          < 0.5
        for: 10m
        labels:
          severity: warning
        annotations:
          summary: "Auth success ratio below 50%"