Install Diagrams for Jira from the Atlassian Marketplace, open any issue and use the Diagrams panel, or ••• → Diagrams, to create a draw.io, Excalidraw or Mermaid diagram. Press Save to keep it on the issue. Apps → Diagrams lists every diagram you can see.
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Before you start
You need to be a Jira administrator to install the app from the Atlassian Marketplace.
People who can browse an issue can view its diagrams. People who can edit the issue can create, edit and delete them. See Permissions.
The draw.io editor loads from diagrams.net, so your network must allow embed.diagrams.net, app.diagrams.net and viewer.diagrams.net.
Install the app
In Jira, go to Apps → Explore more apps, search for Diagrams for Jira and install it.
Open any issue. The Diagrams panel appears in the right-hand column.
As an admin, open Jira settings → Apps → Diagrams settings (or Configure in Manage apps) to choose which editors people can use and how AI works.