Investigate API throttling in routes API calls

[andrewsykim]

The Azure provider implemented caching in front of their routes interface to overcome API rate limiting (routes controller is extremely aggressive with the way it calls APIs), we should investigate if this is a common problem across providers (especially at larger scale) and come up with a common solution if it makes sense.

ref: kubernetes/kubernetes#60646

[fejta-bot]

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/lifecycle stale

[feiskyer]

/remove-lifecycle stale

[andrewsykim]

If folks have user stories on how bad the API throttling for routes controller is, that would be really helpful in determining the priority for this issue.

[fejta-bot]

Issues go stale after 90d of inactivity.
Mark the issue as fresh with /remove-lifecycle stale.
Stale issues rot after an additional 30d of inactivity and eventually close.

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/lifecycle stale

[cheftako]

/remove-lifecycle stale

[cheftako]

/lifecycle frozen

[andrewsykim]

/help

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