promote ServiceIPStaticSubrange to beta

[aojea]

• One-line PR description: KEP-3070: promote to beta

• Issue link: Reserve Service IP Ranges For Dynamic and Static IP Allocation #3070

• Other comments:

[aojea]

/assign @thockin @johnbelamaric

[thockin]

Thanks!

/lgtm
/approve

[johnbelamaric]

One little question but otherwise lgtm.

[johnbelamaric]

Theoretically, it would be possible that IP allocations take slightly longer, of in the event of some sort of bug, a lot longer. I see metrics above around error rates, do we track IP allocation time today (I suspect NOT).

[aojea]

There are no metrics about IP allocation time, I've considered to add those metrics but the problem is that they are tied to the implementation of the allocator Interface, in this case the bitmap, but the same logic is used for nodeports, so you can't differentiate IPs from NodePorts when you are using the bitmaps. However, sounds a good metrics to add in the new API for Service allocation.

Operations can take longer, but this only changes the strategy to find a free number into a bitmap, with current change instead of doing a linear search in the whole bitmap with size N, we split the bitmap by a constant. We do the linear search on the N-K, and if not found , do the search in the remaining K bits, and K is always a small number, I don't think that there is much impact on a Service Create API call

[wojtek-t]

Agree with Antonio.

[johnbelamaric]

/approve

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: aojea, johnbelamaric, thockin

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