This adds fields to the initialSync section of the replication getstatus output.

syncSourceUnreachableSince: Date type, time at which sync source become unreachable. Field not present if sync source is currently available.

currentOutageDurationMillis: NumberInt type, length of time sync source has been unreachable. Field not present if sync source is currently available.

totalTimeUnreachableMillis: NumberInt type, total time we have been retrying (down) during the current initial sync attempt.

Also added to each member of the subfield array "attempts" (which doesn't appear to be documented currently?)

totalTimeUnreachableMillis: Total time we were attempting to retry operations

operationsRetried: Total number of times we attempted to retry an operation

initialSyncAttempts.rollBackId: rollback ID the sync source had at the start of the attempt