Hi syedismael -
Yes with 3.0 the Monitoring apps pull data from the QRS database and use REST data connections starting with qrs.
With 3.x and forward, it becomes important to configure the Monitoring Apps, especially in multi-node environments.
Please refer to the configuration steps in the help:
Some main pointers are:
1- update the ServerLogFolder and ArchivedLogsFolder to use the fully qualified domain name of the central node (in place of c:\programdata...
2- Update the qrs_ data connections replacing the URL localhost also with the fully-qualified domain name of the central node (or wherever the QSR database is)
3- You might need to update the qrs_ database connections further if you use a virtual proxy prefix on the virtual proxy using windows authentication. (Note: it is a requirement to have at least one virtual proxy which uses windows authentication for the 3.x monitor apps to reload).
4- You may need to grant the user account that is running the Qlik services as "RootAdmin" in QMC. This is to allow the reload to fetch data from the Users endpoint in the QRS.
Yes, you can remove the existing Monitoring Apps (Operations Monitor & License Monitor) any time and re-import them from qlik\sense\repository\defaultapps folder
You can also remove all the "governance..." QVDs located in qlik\sense\log.
However, during an upgrade, you should get the latest apps imported automatically and the existing "old" apps just get renamed and un-published.