docs: void safeAddToDuplicateCounterMap(long dpKey, DuplicateCounter counter) {
          DuplicateCounter existingDC = m_duplicateCounters.get(dpKey);
          if (existingDC != null) {
              // this is a collision and is bad
              existingDC.logWithCollidingDuplicateCounters(counter);
              VoltDB.crashGlobalVoltDB("DUPLICATE COUNTER MISMATCH: two duplicate counter keys collided.", true, null);
          }
          else {
              m_duplicateCounters.put(dpKey, counter);
          }
      }