New dashboard: MySQL Group Replication Summary

The problem: We don't have Dashboard for Group replications in PMM

Proposed solution: use PoC we implemented in PMM-6180 

Questions: 

• technical implementation on getting  data  

Doc: 

1. update doc about dashboards 

Original report: 

We need to implement dashboard(s) for MySQL Group Replication
similar to what we have for PXC.

–
Peter Zaitsev, CEO, Percona

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