@Override
    public String toString() {
        if (this == NO_RETRY) {
            return "RetryDecision(NO_RETRY)";
        } else if (this == NEXT) {
            return "RetryDecision(NEXT)";
        } else {
            return "RetryDecision(RETRY(" + backoff + "))";
        }
    }
Returns a {@link RetryDecision} that skips the current {@link RetryRule} and
tries to retry with the next {@link RetryRule}.
core/src/main/java/com/linecorp/armeria/client/retry/RetryDecision.java