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  1. Core Server
  2. SERVER-33285

Add "thread time waiting for response from replication sync source" stats

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      When there is an increase in replicated write ops to a secondary, serverStatus includes stats for reader threads waiting for a global lock Global timeAcquiringMicros r, but doesn't report how this would have impacted the thread reading the oplog to replicate to another secondary (in case of a chained replication).
      It would be good to have "thread time waiting for a response from replication sync source" since that information is useful for diagnosing problematic lagging nodes.

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