[ray tune] access the Tuner.tune_config.metric in a trial

[raytune_kuberay_user]

Is there are method to access Tuner.tune_config.metric in a trial? just like we can get trial name via air.session.get_trial_name()

def train_func(hp):
      // tuning_metrics = ? // is there a method to access it?

trainable = HorovodTrainer(
                train_loop_per_worker=train_func,  xxx)
tune = tune.Tuner(trainable, tune_config=TuneConfig(metrics="ABC"), xxxxx)