Pause/resume Percona XtraDB Cluster

There may be external situations when it is needed to shutdown the Percona XtraDB Cluster for a while and then start it back up (some works related to the maintenance of the enterprise infrastructure, etc.).

The deploy/cr.yaml file contains a special spec.pause key for this. Setting it to true gracefully stops the cluster:

spec:
  .......
  pause: true

To start the cluster after it was shut down just revert the spec.pause key to false.

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