How could we make a filter that shows issues which were modified by specific user/s? By modified I mean all actions - e.g. transitioned issue, was assignee, commented, etc.
There is a feature request open for this, but it is not currently possible to do this as widely as you are looking for: https://jira.atlassian.com/browse/JRASERVER-15235
There are a few fields that have historical searches enabled, specifically
For example:
status changed by user_name OR assignee was user_name
This will show all issues that were transitioned by that user, or ever assigned to that user. See Advanced Searching for more details - there are a lot of things you can do with JQL that aren't obvious out of the box.
If you have Scriptrunner installed, you can find issues commented by a given user
issueFunction in commented("by user_name")
Throw all of those together and you will get pretty close to what you're looking for! Keep in mind that these are very slow queries, so always define a project in your query when you can, and focus on the information that you find most important.
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