docs: void freeOutstandingTxns() {
          assert(!shouldCheckThreadIdAssertion() || m_expectedThreadId == Thread.currentThread().getId());
          for (PartitionInFlightTracker tracker : m_trackerMap.values()) {
              for (Iv2InFlight inflight : tracker.m_inFlights.values()) {
                  m_outstandingTxns--;
                  m_acg.reduceBackpressure(inflight.m_messageSize);
              }
          }
      }