Add docs about multi cluster prom monitoring (#1490)#1768

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ti-chi-bot merged 1 commit intopingcap:release-1.3from ti-chi-bot:cherry-pick-1490-to-release-1.3

Mar 21, 2022

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Commits on Mar 21, 2022

Add docs about multi cluster prom monitoring (pingcap#1490 )

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