release-22.2:Backport!6809

Merged Andrey Vertiprahov requested to merge cherry-pick-6b370b22 into release-22.2

Add ReadPreference to MetricsService.

See merge request !6809 (merged)

(cherry picked from commit 6b370b22)

3ab0936b Add ReadPreference to MetricsService. df5ba1d4 Fix typo on diagnostic alarm.

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