Protocols
Rate limit
A rate limit bounds how many operations a caller may perform in a time interval.
How it works
Limits protect capacity and distribute access among clients. Responses should communicate remaining quota and retry timing.
A concrete example
Illustrative: allow 60 requests per minute and return 429 on request 61.
Do not confuse it with Concurrency limit
a rate limit counts operations over time; a concurrency limit bounds simultaneous work.