Additional features

[Jimmy-Newtron]

During install of the chart I want the following setup:

1. Disable Grafana installation to reuse an existing one
2. Add Historian liveness/readiness probes for initial startup that was blocked on error
   (simple rollout restart of deployment solved the issue)

[lhubert]

Hello,
Your issue seems to be this one: #1
A workaround is documented.