PlantUML Readiness Review

This MR is for the readiness review for enabling PlantUML

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If you have no remarks about the content of the text, consider the following questions:

• Is there enough documentation in our runbooks such that we can recover from a failure of the Container Registry Service?
• Are there appropriate Pages in place such that we get alerted when the Container Registry begins to fail?
• Is the documentation in our runbooks sufficient that if the bus factor is high, another member of Infrastructure can successfully rebuild both the cluster, and deploy the Container Registry?
• Do we pass security guidelines with a nicely hardend installation and use of GKE?
• Is there anything questionable with the method chosen to deploy the Container Registry?
• Are there any improvements someone would suggest to either our deployment mechanism, the use of GKE, or the configuration of the Container Registry?
• Do team members have knowledge of being able to successfully setup and connect to the Kubernetes Clusters and perform troubleshooting processes?
• Can team members find the logs and dashboards we've created to assist with monitoring both Kubernetes and the Container Registry?