public CircuitBreakerRuleWithContent<T> thenSuccess() {
        return build(CircuitBreakerDecision.success());
    }
Returns a newly created {@link CircuitBreakerRuleWithContent} that determines a {@link Response} as
a success when the rule matches.
core/src/main/java/com/linecorp/armeria/client/circuitbreaker/CircuitBreakerRuleWithContentBuilder.java