## Reference

### Design details

	overrideHelpStr = `If true, allow revision tags to be overwritten, otherwise reject revision tag updates that
overwrite existing revision tags.`
	revisionHelpStr = "Control plane revision to reference from a given revision tag"
	tagCreatedStr   = `Revision tag %q created, referencing control plane revision %q. To enable injection using this
revision tag, use 'kubectl label namespace <NAMESPACE> istio.io/rev=%s'
`

    #
    # certSigners:
    #   - clusterissuers.cert-manager.io/istio-ca
    certSigners: []
    # enable pod disruption budget for the control plane, which is used to
    # ensure Istio control plane components are gradually upgraded or recovered.
    defaultPodDisruptionBudget:
      enabled: true
      # The values aren't mutable due to a current PodDisruptionBudget limitation

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