Circuit breaker used for stopping accepting requests when the sequencer is overloaded and falling behind on processing blocks. It works by keeping track of the lastTs on each block process and computing a delay between that timestamp and current time. If the delay is larger than allowedBlockDelay, a failure is registered.

Following the circuit breaker logic described in https://doc.akka.io/libraries/akka-core/current/common/circuitbreaker.html, after maxFailures consecutive failures, requests will no longer be accepted (state goes from closed to open).

After a resetTimeout amount of time has passed in the open state, the circuit goes to half-open state, where requests are accepted, and if the next block delay registered is in the accepted interval, the circuit breaker closes again and requests are accepted, otherwise, it goes back to being open (and requests not accepted). In this case, the resetTimeout is multiplied by the exponentialBackoffFactor to compute the next timeout (up until at most maxResetTimeout).

It is possible to configure separate config breaker parameter per message type.