Firebase Docs Reference Action.Metadata public static interface Action.Metadata Represents the metadata for an Action. Nested Class Summary class Action.Metadata.Builder The builder for Action.Metadata. Except as otherwise noted, the content of this page is licensed under the Creative Commons Attribution 3.0 License, and code samples are licensed under the Apache 2.0 License. For details, see our Site Policies. Java is a registered trademark of Oracle and/or its affiliates. Last updated June 18, 2018.