What is the use of `action_metadata` in `PolicyPrediction` objects?

The method predict_action_probabilities() of a Policy returns PolicyPrediction object. In doing so we have option of setting action_metadata. What is the use of this parameter? Is it just for giving more information about our predicted action?
Suppose the policy predicts and leads to execution of certain action then, will this metadata be sent to that action during execution?
Documentation link: rasa.core.policies.policy