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Should instantiate ReshardingMetrics object with the persisted data
Tracked quantities in the ReshardingMetrics class:
- runningOperation time interval (c)
- ** opStatus (d, c, r) always set to running.
- copyingDocuments time interval (r)
- documentsToCopy (r)
- documentsCopied (r)
- bytesToCopy (r)
- bytesCopied (r)
- applyingOplogEntries time interval (r)
- oplogEntriesFetched (r)
- oplogEntriesApplied (r)
- // inCriticalSection time interval (c)
- // writesDuringCriticalSection (d)
- donorState (d)
- recipientState (r)
- coordinatorState (c)
d = donor
r = recipient
c = coordinator
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