Which of the following actions can you perform on an issue in Jira?

In Jira, one of the actions you can perform on an issue is to delete it permanently. This action allows users with the necessary permissions to remove an issue from the project and the Jira system entirely. It is a significant action since once an issue is deleted, it cannot be recovered; hence, it should be done with caution.

Deleting an issue might be required in situations where a ticket was created in error, is no longer relevant, or needs to be removed for any number of reasons related to project management practices.

The other options highlight actions that do not correspond with standard functionalities available for issues in Jira. For instance, checking if an issue was previously watched does not constitute an action that can be taken on the issue itself. Similarly, the ability to only change the priority level is too restrictive, as users can perform a broader range of actions, including editing various other fields, adding comments, assigning users, and moving issues between different states. Therefore, the ability to delete an issue stands out as a clear action that can be performed.