We have an upgrade scheduled for APPMON/UEM in our production environment, scheduled for Saturday. However, there are a few servers with 6.1 agents that will need some unrelated updates on Thursday, requiring these servers to be restarted on Thursday. They want to know if we can use this opportunity to upgrade the agents on these servers from 6.1 to 6.5 on Thursday. Will this impact anything, since the production upgrade to 6.5 is not scheduled until Saturday?
Since you will be upgrading from 6.1 to 6.5, there is no need to upgrade agents manually on each server. When you upgrade your Dynatrace Platform, the agents will be auto upgraded on reconnect to the new version server with the help of bootstrap agent. Also, the 6.5 agent will not be compatible with the 6.1 collector. Please refer the documentation here, https://www.dynatrace.com/support/doc/appmon/installation/upgrade-and-migration-guide/prepare-to-upgrade/component-compatibility/