An Azure service that is used to collect, analyze, and act on telemetry data from Azure and on-premises environments.
Thank you verry much @Maxim Sergeev for your valuable support.
I was able to remove the ARO form the monitored cluster by
1- Removing all omsAgent Pods from Openshift
2- Since the onboarding legacy script uses "az deployment create " to deploy the monitoring solution to the Resource Group. identified the Deployment Name from the ressource group overview and executed "az deployment delete"
3- I noticed that the legacy script was adding a tag with the log workspaceID to the ARO resource, I just delete it
I'm ready to start the ARC onboarding for the ARO cluster.