code: def metrics(self) -> list:
          
          return [
              AveragingNamedMetric("policy_loss"),
              AveragingNamedMetric("value_loss"),
              AveragingNamedMetric("policy_entropy"),
              AveragingNamedMetric("approx_kl_divergence"),
              AveragingNamedMetric("clip_fraction"),
              AveragingNamedMetric("grad_norm"),
              AveragingNamedMetric("advantage_norm"),
              AveragingNamedMetric("explained_variance")
          ]
docs: List of metrics to track for this learning process