web vitals improvements

[pauldambra]

Feature request

feedback from @Lior539

To keep costs in control it would be great if: I could set a sampling % e.g. only collect for 10% of users I could set which metrics I want to capture e.g. Im only interested in INP. But if enabling autocapture captures for all 6 and each one is captured separately in a different event, I end up capturing 6x more events than I need to

we wait for a little while so if a page emits 6 web vitals metrics we might only capture one event but since the time until metrics are available varies the best we can say is 1 - 6 events per pageview

on posthog this is working out as around 0.2 events per pageview - mostly because we have client side navigation

but we can definitely

• [ ] add sampling it fits really well for something super aggregate like this
• [ ] choose which metrics to capture - this makes UI harder since we can't guarantee presence but since it's an active choice that should be self-explaining
• [ ] choose which URLs to enable capture on (this comes up in replay a lot so it would be interesting to see how it works here)

Debug info

No response