Allow setting custom relative time for alert snapshot

[calind]

Currently alerting snapshot (the image sent by mail) uses the dashboard time (eg. 12 hours ago) or time overrides from Time range graph setting.

It would be useful to have a Time range override per alert rule, so for example in dashboard the graph is displayed for last 12h, but when receiving an alert email the graph is displayed for the last 2h.

[bergquist]

I think both options makes sense. Queries with some aggregations might not show as alerting in the 24h window but in last 2h. I dont think its a good idea to send an image not breaking the threshold.

Perhaps we should send two images?

[calind]

I think one image suffice. What I'm saying is that it would be useful to have a Time range override per alert, which should be taken into account when sending the graph snapshot and computing the thresholds.

This way I can have a zoomed in version in my email, and also for queries doing aggregation (which might be time range sensible) a more stable time range. - All these optional, if I decide I need it.

[arno01]

Now that the snapshots are 2h back (the difference between my server set to UTC and my local time), it would also be nice to see an option for specifying the TZ (timezone) for the email alert snapshot.

[maemigh]

+1

[github-actions]

This issue has been automatically marked as stale because it has not had activity in the last year. It will be closed in 30 days if no further activity occurs. Please feel free to leave a comment if you believe the issue is still relevant. Thank you for your contributions!

[armandgrillet]

This request still makes sense with Grafana Alerting but is not a priority in terms of changes for the screenshot service we now use. Removing the label stale and moving this to our backlog.