I would like to know if there is a way of finding which Jira filters are really used.
Subscribtions are not the only way of using Jira filters. It's something normal to have scripts that are quering Jira API using a filter name.
For example I do want to know if there is any filter that was not used in more than two years.
You are right, filters could be used in all sort of places. There could be scripts, as you suggested. Then there could be third part stuff which uses filters and that data could be in its own configurations tables or AO tables.
I guess you will have to go with the owners and start deleting them, until you hear from someone that something is broken!
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