Description

Description:

Added 5 new fields to serverStatus.transactions:

totalPrepared (type: long, default: 0) - the total number of prepared transactions since the last server startup.

totalPreparedThenCommitted (type: long, default: 0) - the total number of prepared transaction commits.

totalPreparedThenAborted (type: long, default: 0) - the total number of prepared transaction aborts.

currentPrepared (type: long, default: 0) - the current number of transactions in the prepared state.

oldestActiveOplogEntryOpTime (type: timestamp, default: Timestamp(0, 0)) - the optime of the oldest oplog entry for any active transaction.

Engineering Ticket Description:

Similar to the transactions diagnostics project, we want to maintain certain metrics in the serverStatus section. The TransactionsSSS::generateSection method returns a BSON object that goes into the transactions section of the serverStatus output.

This ticket can be split into multiple commits if needed. We will want to output:

• the total number of prepared transactions

• the total number of committed prepared transactions
• the total number of aborted prepared transactions

We will need to add these counters to ServerTransactionMetrics and the transactions_stats.idl class, so that we can serialize these counters to the serverStatus output object in the TransactionsSSS::generateSection method.

We will also update the TransactionMetricsObserver to increment/decrement the stats when appropriate.

Scope of changes

serverStatus page only

When we doc 2-phase commits, that will contain more info and affect more pages

Impact to Other Docs

MVP (Work and Date)

Resources (Scope or Design Docs, Invision, etc.)