I've been tasked with coming up with an automation that would roll-back the current version of OneAgent (on RHEL) to a previous version. Is a rollback mostly a matter of running the /opt/dynatrace/oneagent/agent/uninstall.sh and then performing an installation of previous version? I understand that the new versions of configuration files might not be compatible with an older version of software, but I don't really see any good way around that.
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You are right, you would need the process/container restart as it's a new version of the OneAgent code module which is injected into the application processes. So using the Dynatrace UI to validate which all processes would need the restart will help the respective team to know the specific entities to restart and not the entire application.