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We removed the nodes from tiers & nodes and it's removed from the application agent, it's throwing the below error when we trying to delete the machine agents even though the agents are not associated with any nodes or application.
attached the error snip fyr.
Thanks for posting the question on the Community.
To delete machine agent, you also need to delete the machine associated with your agent from the servers list.
You can do that by these steps:
After this, you can delete machine agent.
Also, please ensure no application is associated with your machine agent by looking at “Application” field in your machine agent.
This is documented here: https://docs.appdynamics.com/display/PRO45/Manage+Machine+Agents
If you still have an error by this operation, please follow this solution as well: https://community.appdynamics.com/t5/Knowledge-Base/Delete-abandoned-machine-agent/ta-p/22547
You can do that by these steps from controller:
Let me know if this helped you.