GitHub user anntnzrb added a comment to the discussion: No 
management-server.log log after update from 4.19.0 to 4.22.0 and some VR VPC 
problems

CloudStack 4.20+ migrated from Log4j 1.x to Log4j2, which has incompatible 
configuration format. Your `/etc/cloudstack/management/log4j-cloud.xml` file 
likely still uses the old Log4j 1.x format from 4.19. Replace it with the 
Log4j2 format (check the template at `server/conf/log4j-cloud.xml.in` in the 
repo), ensure the symlink `log4j.xml → log4j-cloud.xml` exists, then restart 
cloudstack-management. The SLF4J NOP warning confirms the logger failed to 
initialize due to config parsing failure.

GitHub link: 
https://github.com/apache/cloudstack/discussions/12208#discussioncomment-15200156

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