podAffinity: # with pod Affinity, I help him stay close of web
  requiredDuringSchedulingIgnoredDuringExecution:
    - labelSelector:  # select the sentry-web pod
        matchExpressions:
        - key: role
          operator: In
          values:
          - web
        - key: app
          operator: In
          values:
          - sentry
      topologyKey: "kubernetes.io/hostname"  # set topology to node