code: public synchronized void sendTaskStatus(final ReefServiceProtos.TaskStatusProto taskStatusProto) {
      this.sendHeartBeat(this.getEvaluatorHeartbeatProto(
          this.evaluatorRuntime.get().getEvaluatorStatus(),
          this.contextManager.get().getContextStatusCollection(),
          Optional.of(taskStatusProto)));
    }
docs: Called with a specific TaskStatus that must be delivered to the driver.