@Deprecated
    public DnsResolverGroupBuilder refreshBackoff(Backoff refreshBackoff) {
        return autoRefreshBackoff(refreshBackoff);
    }
Sets {@link Backoff} which is used when the {@link DnsNameResolver} fails to update the cache.

@deprecated Use {@link #autoRefreshBackoff(Backoff)} instead.
core/src/main/java/com/linecorp/armeria/client/DnsResolverGroupBuilder.java