Want to create report in which Prioroity upgrades, State changes visible

[SHUBHAM78]

I need all the a report for incident data for Moderate and High Priority Incidents (Priroity levels - 1 2 and 3)
that are Resolved for some queues.

The data I am interested is the field changes e.g. Prioroity upgrades, State changes etc. the Incident[Incident] table only provides Comments and work notes.

we can't use sys_audit table and sys_history_line and sys_journal_field are not reportable in the report.

I have created Metric Definition(metric_definition) for state, assignment group, priority, assigned to. Now I want to create report. How can I proceed further and create report with the above details 

[Mark Manders]

What's not working? Because you already gave the answer: your metric instance table has the changes you are looking for, so that's where your data is. You need to report on those tables.