Currently, we forward all requests from non-leader instances to the leader. In case of e.g. /metrics endpoint, it doesn't make much sense since we want to have non-leader metrics too (e.g. JVM memory/cpu consumption etc.).
We should also check if other endpoints should be proxied too e.g.
- /ping - one needs to ping the non-leader instance
- /info - on needs non-leader parameters (in case they differ)