Hello,
I would like to delete a filter from this page:
https://foo.atlassian.net/secure/ManageFilters.jspa
This filter contains a subscription that is owned by a user that is disabled. This subscription is setup to email a group.
Apparently, site admins (me and others at my company) are not able to remove this disabled user’s subscription.
As a workaround, I made a backup copy of the filter and now want to delete the original filter (thus removing the subscription).
When I go to delete the original filter, I get this:

I'm pretty sure this filter is not associated with a board.
Questions:
- How can I determine where this filter is used (boards, confluence maybe, other)?
- Is it safe for me to hit the delete button?
Thanks!