prometheus-operator: Alertmanager CrashLoopBackOff

What did you do? I want to create Alertmanager in prometheus operator. Kubectl create -f alert.yaml

apiVersion: monitoring.coreos.com/v1 kind: Alertmanager metadata: labels: alertmanager: example name: example spec: baseImage: quay.io/prometheus/alertmanager replicas: 3 version: v0.15.2 nodeSelector: {}

Kubectl get pods shows Alertmanager pod status as CrashLoopBackOff

Pod logs Error from server (BadRequest): a container name must be specified for pod alertmanager-example-0, choose one of: [alertmanager config-reloader]

What did you expect to see? expect to create Alertmanager Pods

What did you see instead? Under which circumstances? Kubectl get pods shows Alertmanager pod status as CrashLoopBackOff

Pod logs Error from server (BadRequest): a container name must be specified for pod alertmanager-example-0, choose one of: [alertmanager config-reloader]

Environment k8s

• Prometheus Operator version: 0.25.0

insert Prometheus Operator logs relevant to the issue here