User count settings would not be applicable to personal subscriptions.
Go to Settings (Cog icon on right top) > Manage apps > General settings (In Vamhi Jira+)
Specify the value in the screen below to restrict all group subscriptions exceeding the specified size.


Try to create subscription for any filter with group whose user-count greater than the threshold.

It will restrict users to create subscription for that group with descriptive popup message.

Manage subscriptions screen it will also add up a functionality to restrict editing the subscription which is having two cases.


i - Same Group Name Updates : Any updates to subscriptions with the same group name will be restricted irrespective of other parameters.

ii - Updates with Different Group Name : Updates to subscriptions with a different group name will be restricted if the new group's user count exceeds the defined threshold. If the group's user count remains within the threshold, subscriptions will be updated accordingly.

→ Go to JIRA ADMINISTRATION settings > click User management > click Groups.
