use dashboard for monitoring by CDS

[cehbrecht]

Description

The existing dashboard should be used for monitoring by CDS:

• provide info graphics and json
• should be run dynamically by CDS
• separate user errors (no valid data points) from internal errors (file system broken, ...)

Environment

• rook version used, if any: 0.7.0
• Python version, if any:
• Operating System:

Steps to Reproduce

Additional Information