backstage/.changeset/solid-ducks-flow.md

@backstage/frontend-defaults, @backstage/frontend-app-api, @backstage/cli

@backstage/frontend-defaults	@backstage/frontend-app-api	@backstage/cli
patch	patch	patch

Deprecated new frontend system config setting app.experimental.packages to just app.packages. The old config will continue working for the time being, but may be removed in a future release.