static RetryRule onStatus(BiPredicate<? super ClientRequestContext, ? super HttpStatus> statusFilter,
                              Backoff backoff) {
        return builder().onStatus(statusFilter).thenBackoff(backoff);
    }
Returns a newly created a {@link RetryRule} that will retry with the specified {@link Backoff} if the
response status matches the specified {@code statusFilter}.
core/src/main/java/com/linecorp/armeria/client/retry/RetryRule.java