public void addContainerThreadPoolSize(Integer threadPoolSize) {
    addToMetricsMessage(GROUP_NAME_FOR_DIAGNOSTICS_MANAGER, CONTAINER_THREAD_POOL_SIZE_METRIC_NAME, threadPoolSize);
  }
Add the configured container thread pool size.
@param threadPoolSize the parameter value.
samza-core/src/main/scala/org/apache/samza/diagnostics/DiagnosticsStreamMessage.java