private State newClosedState() {
        return new State(
                CircuitState.CLOSED,
                Duration.ZERO,
                EventCounter.ofSlidingWindow(ticker, config.counterSlidingWindow(),
                                             config.counterUpdateInterval()));
    }
Creates a new {@link NonBlockingCircuitBreaker} with the specified {@link Ticker} and
{@link CircuitBreakerConfig}.
core/src/main/java/com/linecorp/armeria/client/circuitbreaker/NonBlockingCircuitBreaker.java