public void startFunctionExecution(boolean haveResult) {
    // Increment number of function execution calls
    _stats.incInt(_functionExecutionCallsId, 1);

    // Increment number of functions running
    _stats.incInt(_functionExecutionsRunningId, 1);

    if (haveResult) {
      // Increment number of function excution with haveResult = true call
      _stats.incInt(_functionExecutionsHasResultRunningId, 1);
    }
  }
Increments the "_functionExecutionCallsId" and "_functionExecutionsRunningId" stats and
"_functionExecutionHasResultRunningId" in case of function.hasResult = true..
geode-core/src/main/java/org/apache/geode/internal/cache/execute/metrics/FunctionServiceStats.java