apiVersion: monitoring.coreos.com/v1
kind: Alertmanager
metadata:
  labels:
    alertmanager: main
  name: main
  namespace: monitoring
spec:
  affinity:
    podAntiAffinity:
      preferredDuringSchedulingIgnoredDuringExecution:
      - podAffinityTerm:
          labelSelector:
            matchExpressions:
            - key: alertmanager
              operator: In
              values:
              - main
          namespaces:
          - monitoring
          topologyKey: kubernetes.io/hostname
        weight: 100
  image: prom/alertmanager:v0.20.0
  nodeSelector:
    kubernetes.io/os: linux
  replicas: 1
  securityContext:
    fsGroup: 2000
    runAsNonRoot: true
    runAsUser: 1000
  serviceAccountName: alertmanager-main
  version: v0.20.0