Provide a monitoring interface for circuit-breakers

[kubamarchwicki]

To be able to monitor the circuit breakers effectively it would be good to expose their state (closed, open, half-open) as of Spring Actuator endpoints without additional effort.

Monitoring the state of circuit breakers would allow discovering that a upstream dependency suddenly becomes unavailable. It is essential for applications used in production.

[ryanjbaxter]

Are we talking about monitoring just in an actuator sense?

[kubamarchwicki]

Yes. At least the current state (as observed: OPEN / CLOSED), possibly last flip time, maybe some statistics - depending on data availability for any given implementation of circuit breakers.

[kubamarchwicki]

Depending on timelines, I should be able to commit some time to that.