Document ingest http codes for Stats outcomes

[realkosty]

Which part? Which one?

https://docs.sentry.io/product/stats/

Description

Currently customers will often observe ingest API calls fail in their browsers console or server logs with certain HTTP error codes (and messages?). It would be good to have a resource that explains those failures and correlates them with stats so they can so how prevalent a particular ingest error is in the grand scheme of things and whether it shows any patterns.

Suggested Solution

mention that (all?) outcomes on Rate Limited category return 429
filtered events get 200 (right?)
invalid will get 4??
etc.

[getsantry]

Assigning to @getsentry/support for routing ⏲️