source-mongodb: additional debug logs when discarding documents #2502
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Description:
Debug logging for when documents are discarded because they are not for a tracked operation type, or because the full document is empty. Both of these event types should be fairly low-volume.
Also adds a sanity check when combining fragments from a split event to make sure that a source MongoDB collection is determined, which could otherwise cause a false negative when checking if that collection is among the tracked collections. I have no present reason to think this will ever happen, but it seems worthwhile to verify.
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