Need a Peroformance overview dashboard

[dbsid]

Enhancement

Currently, to identified a performance issue from top-down. User need to go through multiple dashboard/panels

1. to identify if the performance issue is inside or outside TiDB cluster.
2. to identify the resource usage of TiDB/TiKV/PD nodes.
3. to identify the query duration bottleneck
4. to identify if there is slow query
5. to identify if there is hot spot across the stores.
6. many more ....

There is no good start point and general approach for user to drill down performance issues.
I'll propose to add a performance overview dashboard, to show the core performance metrics on the typical critical path in one dashboard and make the metric analysis on TiDB much easier.