uber / cadence / 018facb1-f3f4-434f-82b7-7bfae9501789

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Committed by web-flow

Commit Message

Global ratelimiter helper: usage-tracking fallback-capable rate.Limiter (#6028)

This commit largely exists to break this out for separate review, as it's relatively simple and isolated.

In a later PR, this will be used by the "limiter"-side logic to track and enforce usage of a ratelimit.  At a high level it does only a couple things:

1. Tracks calls to `Allow() bool` so we can find out how much a limit is actually used (so we can distribute the allowances fairly)
2. Updates ratelimit rates when requested
3. Automatically falls back to different ratelimit if the system seems unhealthy

^ all of which is done in an atomic-like way so concurrent operations do not block each other, as true precision is not necessary.  It only has to be "good enough", and performance is more important than precision.

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