diff --git a/.changeset/2600.md b/.changeset/2600.md
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+---
+'@backstage/plugin-techdocs-backend': minor
+'@backstage/plugin-proxy-backend': minor
+'@backstage/plugin-auth-backend': minor
+'@backstage/create-app': minor
+'@backstage/backend-common': minor
+---
+Add service discovery interface and implement for single host deployments
+
+Fixes #1847, #2596
+
+Went with an interface similar to the frontend DiscoveryApi, since it's dead simple but still provides a lot of flexibility in the implementation.
+
+Also ended up with two different methods, one for internal endpoint discovery and one for external. The two use-cases are explained a bit more in the docs, but basically it's service-to-service vs callback URLs.
+
+This did get me thinking about uniqueness and that we're heading towards a global namespace for backend plugin IDs. That's probably fine tbh, but if we're happy with that we should leverage it a bit more to simplify the backend setup. For example we'd have each plugin provide its own ID and not manually mount on paths in the backend.
+
+Draft until we're happy with the implementation, then I can add more docs and changelog entry. Also didn't go on a thorough hunt for places where discovery can be used, but tbh I don't think there are many since it's been pretty awkward to do service-to-service communication.