Has anyone here done sort of a A/B testing for ApiGwV2 -> Lambda routes? I know gwV1 can do this in the form of canary deploys (kinda) but V2 is limited in options and so far I don't have any ideas for an easy workarounds. My planned usecase is to run A/B with different configurations on real workloads but maybe I'm better off running Lambda Power Tuning once...

I'd just handle this through a header on the backend, and let your frontend handle this through whatever method deemed appropriate. If you mean actual canary testing, that would be harder.

Does gateway V2 support lambda version weighting? I know SAM has direct support for the Canary deploy stuff, but I don't know if that is for HTTP APIs, or only Rest APIs. If you are using lambda it looks like you could set up a weighting by alias/version. I think if you would just be configuring memory size it's worth seeing how far power tuning gets you https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-properties-lambda-alias-versionweight.html

Good find @Simon Reilly, I believe you would need something in place to handle the full shift (as in, something to turn this off), but I see no reason that couldnt be used with any lambda (apig be damned)

Great find @Simon Reilly! And thanks for the further docs @Derek Kershner. I'll follow up on this line of though tomorrow. Need to find out if SST supports selecting aliases first tho 😄