metrics: support multi-k8s in grafana dashboards (#4099)#4206

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ti-chi-bot wants to merge 1 commit intopingcap:release-5.4from ti-chi-bot:cherry-pick-4099-to-release-5.4

+910-453

Commits on Mar 9, 2022

This is an automated cherry-pick of pingcap#4099

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