public Resilience4jCircuitBreakerMappingBuilder registry(CircuitBreakerRegistry registry) {
        this.registry = requireNonNull(registry, "registry");
        return this;
    }
The {@link CircuitBreakerRegistry} from which {@link CircuitBreaker} instances will be
created by default.
An instance created by {@link CircuitBreakerRegistry#ofDefaults()} will be used by
default if unspecified.
resilience4j2/src/main/java/com/linecorp/armeria/resilience4j/circuitbreaker/client/Resilience4jCircuitBreakerMappingBuilder.java