TPA-RFC: define policy on prometheus exporters
while we have some way for people to add exporters to our prometheus/grafana setup, it's not clear how they should actually export those metrics to us.
- do we need HTTPS?
- virtual host or port number?
- restricted to Prometheus scrapers?
- public or private prometheus server?
some of this is already defined or at least elsewhere (e.g. the distinction between prom1 and prom2). but in light of our experience with anti-censorship (e.g. #41265 (closed)), we should more clearly define the above.
anything i forgot here @meskio?
/cc @meskio