code: void markCommandDone(ExecutionResult executionResult, HystrixCommandKey commandKey, HystrixThreadPoolKey threadPoolKey, boolean executionStarted) {
          HystrixThreadEventStream.getInstance().executionDone(executionResult, commandKey, threadPoolKey);
          if (executionStarted) {
              concurrentExecutionCount.decrementAndGet();
          }
      }
docs: /* package-private