Feature - Add link to Pyrra in alerts

[hsolberg]

Hi! As a user receiving alerts from Pyrra, it would be nice to get the URL to Pyrra with the alert. Maybe call the field in the alert something like "pyrra_url". There's a similar issue here where the usecase is to add your own URL (for runbook_url etc). Maybe both should be looked at the same time when considering how this should work.

[metalmatze]

This would be very nice indeed! We probably do something like we do with the runbooks on kube-prometheus, yep. Pyrra already has all the state in the URL, such that sharing or linking to individual pages is totally possible.

If someone wants to work on this and open a PR, that would be very welcome!