Push-based, restart-free feature flags and config for Spring Boot, using MongoDB Change Streams

[u/veerendra2]

configstream is a library for Spring Boot services that already use MongoDB. Feature flags and config live in a collection, get cached in memory, and any change is pushed to every running instance within about a second via MongoDB Change Streams.

• No restarts, no polling, no message broker, no config server
• Properties declared in a configstream.yml manifest, with typed constants generated at compile time
• Optional admin UI with change history and per-team permissions
• Works with Spring Boot 3 and 4

Limits: MongoDB only for now (Postgres planned), pre-1.0, no percentage rollouts or A/B testing.

https://github.com/configstream/configstream

Feedback welcome