public SELF onTimeoutException() {
        return onException((ctx, ex) -> {
            if (ctx.isTimedOut()) {
                return true;
            }
            return TimeoutExceptionPredicate.isTimeoutException(ex);
        });
    }
Adds {@link TimeoutException}.

<p>When this is used for a {@link CircuitBreakerRule}, a {@link Response} is reported as a success or
failure to a {@link CircuitBreaker} or ignored depending on the build methods({@code #thenSuccess()},
{@code #thenFailure()} and {@code #thenIgnore()}).
core/src/main/java/com/linecorp/armeria/client/AbstractRuleBuilder.java