I have restricted a user right to browse my project and only able to view ticket which is assign to him. Would like to know possible for me @ the user and let him able to view the issue. As what permission I need to modify to achieve this.
In addition to @Ravi_Sagar__Adaptavist_'s answer, you'll need to use third part app.
You also have to create a "multiple user picker" custom field. Add this CF to the security level.
When users are mentioned (@) in comments you have to add them to the new CF. Security level will do the rest.
How to check if a user is mentioned in new comments? Here is where third part app must be used. I've done something similar using "Automation for Jira" and I'm certainly sure you can get what you want with this add-on. Also I'm sure you can get it using "Scriptrunner".
There's no option to do what you are asking for using Jira's native configurations.
Hope it helps!
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