Who is using what plugins?

[Kannan S]

Is there a way in JIRA api to find out the list of users using a specific gadget/plugin?

How is the user and plugin mapped? ie., how does the jira identifies a user's plugins.

Say there are two users.

User A is using the "Assigned to Me" gadget.

User B is NOT using the "Assigned to Me" gadget.

How do i programmatically find out the list of users who are using the "Assigned to Me" Gadget or any other "user-installed" add ons?

A few plugins are used by a specific group or common to all.

How do we know whether a plugin is used by a user or groups?

[Ubisoft]

I would suggest using the DB since you cannot with the API.

example :
SELECT * FROM portalpage p, portletconfiguration pc where pc.portalpage = p.ID and gadget_xml like '%GADGET%'