Making some members Public

[ollie-kane-CB]

I'm interested in being able to use existing resources that are tagged with labels as filters. For example, rather than a full blown CRD, often times i want to use something like a TLS secret which are created via a Certificate resource. The ResourceWatcher is almost perfect, the Leader Aware version even better. Sadly, they don't accept label filters as arguments and since they're internal sealed, I can't extend these. If this is something you're open to have, I'd happily author the fork, but it'd be useful to know the desired implementation of such a thing.

[ollie-kane-CB]

To provide some specifics here,
after creating my new entity, i found a pattern emerging with my newly created UI was that i would have to poll for updates. I have a SignalR Hub, and if I could elect to watch specific resources with the same Leader aware system already in place, my web clients can get realtime updates on relevant resources instead of the very heavy polling i'm doing today. In cases where those resources are a subset indicated by matching labels, there doesn't appear to be a direct way to do this.

A filter like this is also useful to get behavior similar to a IngressClassName or a PV storage class. A specific label or indicator can be used to "not watch" for irrelevant changes.