Add webhook support and prometheus

[dkess]

Curious on people's thoughts on this. Instead of creating a new service to process IRC webhooks, we can use create's HTTP server. This could also be used to capture GitHub webhooks.

[kpengboy]

Sounds OK, given that we already use create for Debian security advisories and the like.

If you choose to go this route, though, best would be to make the webserver its own module and register handlers through other modules. (Perhaps consider Flask?)

[dkess]

Hmm, Flask sounds like be a good idea. Might close this at some point and re-open with a different design approach.

[jvperrin]

I'd agree with @kpengboy that splitting out the web server (and maybe using Flask) and then having some kind of plugin hook system for the web server would be better than this.

[fydai]

We should be able to do this now, with the new Flask setup.