Deprecation and Migration
A mature API should not suddenly remove old functionality. Consumers need notice, migration documentation, compatibility periods, telemetry, and a defined sunset strategy.
Track which API versions and endpoints are still being used. A deprecated endpoint can emit deprecation metadata or documentation links while remaining functional during the migration period.
Versioning is not a substitute for good API evolution. The best APIs minimize unnecessary breaking changes.
Key Takeaways
- Versioning should solve real compatibility problems.
- Deprecation requires communication and observability.
- Backward-compatible evolution is preferable to constant version proliferation.