code: public synchronized void pause() {
          // use compareAndSet to make sure it stops only once and when running
          if (running.compareAndSet(true, false)) {
              logger.debug("Stopping the HystrixMetricsPoller");
              scheduledTask.cancel(true);
          } else {
              logger.debug("Attempted to pause a stopped poller");
          }
      }
docs: Pause (stop) polling. Polling can be started again with <code>start</code> as long as <code>shutdown</code> is not called.