To setup prometheus operator we can use the helm chart to do so


helm repo add prometheus-community https://prometheus-community.github.io/helm-charts

helm repo update

helm install monitoring prometheus-community/kube-prometheus-stack \
  -n monitoring --create-namespace

And then create the prometheusRule to create an alert. The important thing here is the metadata: labels which needs to match the pod that you're trying to applied to. Regardless if this is a simple vector(1)==1 eample, it needs to match for the trigger gets generated. 

apiVersion: monitoring.coreos.com/v1

kind: PrometheusRule
metadata:
  name: always-firing
  namespace: monitoring
  labels:
    release: monitoring
spec:
  groups:
  - name: test-alerts
    rules:
    - alert: AlwaysFiring
      expr: vector(1) == 1
      for: 0s
      labels:
        severity: critical
      annotations:
        summary: "This is a guaranteed firing alert"
        description: "This alert always fires because 1 == 1."

And then you can see that the alert is coming out.







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