Document that Auto DevOps apps should not be manipulated outside Helm
From https://gitlab.slack.com/archives/C6TH0GGB1/p1504542849000108:
regarding broken replica number we messed with the internal tiller representation of the deployment.
TILLER_NAMESPACE=minimal-ruby-app-09-04-41 helm get manifest production
showed 5 replicas so tiller didn't changed the replicas in the deployment because it didn't changed from its point of view lesson learned: never touch tiller owned resources
We should document that apps deployed from Auto DevOps (or using our auto-deploy-app
chart, or really any Helm chart) shouldn't be manipulated directly from k8s. I'm not sure the extent of that restriction, but anything specified in the chart could at least get overwritten on subsequent deploys, or could be ignored as the case above. Either case would be bad.