Feature request: unenforced / test-only limits

[dweitzman]

Would be used as a precaution against being accidentally overly-aggressive when setting new rate limits on existing systems.

It'd probably be useful if both real and check-only limits could co-exist for the same rate limit pattern, to help with testing whether it would be safe to lower an existing rate limit.

I'm imagining something like check_only_requests_per_unit or test_requests_per_unit that could be set side-by-side with or in place of requests_per_unit and increment a different metric name instead of the existing over-limit metric (and near-limit metric) when it would have triggered.

[mattklein123]

Yeah I agree this would be a nice feature to have.

[repl-david-winiarski]

We added shadow mode functionality to our fork as a way of handling this situation replicon#12

[jespersoderlund]

@repl-david-winiarski This is exactly what we're looking for! Is there a reason for not merging your changes upstream? I think it would be very valuable

[jespersoderlund]

@repl-david-winiarski PR (#294 ) for shadow-mode is now merged which would have a similar effect to what you are after