backstage/.changeset/empty-mugs-bow.md

@backstage/core-plugin-api

@backstage/core-plugin-api
patch

The authentication APIs are no longer @alpha. Since the @backstage/core-plugin-api has no /alpha entrypoint, the only effect of marking the APIs as @alpha was to hide them in documentation. They are still expected to be widely used and there will be a migration path if they are changed in the future.