Please see several places in JIRA as pictured where there's an inconsistent language being used between the UPM plugin who seems to have changed the word "Plugin" to "Add-on" and JIRA who seems not to have been made aware of this change, and continues to call plugins "Plugins".

Noted in g+g admin search, Administration panel, and admin drop down menu. This it not a definitive list and could be lingering elsewhere.

In the g+g search in the past the word "plugins" was then alised to "add-ons" the concern is that if in the JIRA heading that word changes to add-ons then typing in "Plugins" will not return any results any longer.