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Backwards Compatibility:
Fully Compatible
Backport Requested:

v4.2
Sprint:
Sharding 2019-07-15, Sharding 2019-07-29, Sharding 2019-08-12, Sharding 2019-08-26
Confidence Status:
None
Work Order:
3
CAR Domain/s:
None

Tracking the per transaction metrics from the scope for each TransactionRouter.
Logging the relevant metrics in currentOp for transactions on checked-out sessions.
Logging the relevant metrics in currentOp for transactions on checked-in sessions when idleSessions=true.

depends on

SERVER-41676 Make the TransactionRouter threadsafe using the observer pattern

has to be done after

SERVER-42457 Check if cluster time has been set on TransactionRouter before observing from an external thread

SERVER-40981 Create class for tracking single sharded transaction metrics on mongos

has to be done before

SERVER-42907 Add timeActiveMicros and timeInactiveMicros for transactions in mongos currentOp output

related to

SERVER-40985 Log metrics on mongos when slow transaction completes