http://eweiibe6tdjsdprb4px6rqrzzcsi22m4koia44kc5pcjr7nec2rlxyad.onion/help/operations/incident_management/alerts.md
You can upload screenshots of metric charts in the Metrics tab.
To do so, either:
Select upload and then select an image from your file browser.
Drag a file from your file browser and drop it in the drop zone.
When you upload an image, you can add text to the image and link it to the original graph.