Improve sync source selection logging

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    • Replication
    • Fully Compatible
    • v7.0, v6.0, v5.0, v4.4
    • Repl 2023-09-04, Repl 2023-09-18
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      Improve log verbosity around sync source selection to include reasons why a certain node is/isn't chosen as a sync source. For example, customers want to know why the "nearest" node isn't chosen (e.g. not being a voter) when initialSyncSourceReadPreference is "nearest".

      FWIW, currently in the function _isEligibleSyncSource, we have some debug log messages (e.g. "Cannot select sync source because we are a voter and it is not"). I wonder if it would be good enough to make those info level logs.

            Assignee:
            Evelyn Wu
            Reporter:
            Lingzhi Deng
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