apiVersion: monitoring.coreos.com/v1
kind: PrometheusRule
metadata:
  labels:
    prometheus: kube-prometheus-stack-prometheus    # dieser name ist fest
    role: alert-rules                               # auch fest
    release: kube-prometheus-stack                  # IMPORTANT: ohne das Label wird die Rule vom PrometheusOperator nicht gefunden
  name: prometheus-msteams-alert
  namespace: monitoring              # Rule im namespace anlegen in dem die zu ueberwachende App laeuft
spec:
  groups:
    - name: msteams_alerts
      rules:
        - alert: PrometheusMSTeamsDown
          expr: up{job="prometheus-msteams"} == 0
          for: 5m
          labels:
            severity: critical
            receiver: email
          annotations:
            summary: "Prometheus MSTeams is down"
            description: "The prometheus-msteams service has been down for more than 5 minutes."