Rate limiting by percentage

[Thangamani J]

Hi team,

I'm in process of implementing following use case, please help me with your
inputs.

let's say I have endpoint /rate-limit and it should
75% of time, it should return "SUCCESS" as text
25% of time, it should return "FAILED" as text

I did try limit_req_zone which goes by request per second and when exceeds
it responds with status code 503. But in this case i want an actual
response and the percentage of FAILED/SUCCESS to be configurable.

Any pointers for above use case would be helpful.

Thanks,
Thanga.
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