GSA selector for active/inactive gsSet

[foriequal0]

We use Agones for short multiplay sessions (~10m per sessions)
Naturally, we wanted to a rolling update plan like this:

1. Keep scaling down old non-Allocated gs (buffers), while scaling up new gsSet when the Fleet is updated.
2. Incoming users are allocated to new active gameservers.
3. Sessions are short, so old gsSet is fully drained soon.

But we found that we can't do 2. using current selectors of GSA.
We might be able to do that by manually labeling gsSet and GSA, but it is cumbersome and prone to error.

[markmandel]

I think this is duplicate of:

• GameServers in allocated state can respond to fleet updating #2682

Which is currently underway. (I have the code, I need to finish submitting it all -- sorry, GDC got in the way).

Please let me know if I'm wrong in this though, and you want something different.

[gongmax]

#2682 provides an opt-in solution, which is good. But should we make it a default behavior that the allocated GS from an old gameserverset has lower priority when performing an allocation? I assume customer would want to allocate new incoming users to new gameservers after Fleet update, but I could be totally wrong.

[markmandel]

🤔 interesting question. It probably depends what the end user wants to optimise on: Infrastructure packing or speed of moving to a new version - and that might go either way I feel.

[gongmax]

Interesting, we might be able try the best to learn end user's preference, i.e. if the scheduling is Packed, then they may prefer infrastructure packing. If it's Distributed, then infrastructure packing might not be a major concern.

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