Problem

After upgrading to R4J - Requirements Management for Jira version 4.x from 3.x, all coverage views have disappeared.

Solution

From R4J 4.0.0, major architectural changes in the coverage views have been applied.
Due to this, all saved coverage views must be migrated manually to the new coverage services when upgrading to R4J 4.x from any version older than 4.0.0.
To do this, follow the steps below:

The migration may take a while depending on the number of saved coverage view filters you have.

Further troubleshooting articles

For further troubleshooting, below are some guides to solve some known issues with the migration and upgrade:
Coverage view does not work after upgrade
Migration of coverage views in R4J 4.0 failed
R4J does not work or shows errors after update
Gadget error after upgrading to 4.x