In Manage Metrics, I cannot delete a custom metric even if I have already deleted all my custom made Monitor pack using this metric. Why do I always get the message "The metric cannot be deleted. It is being used in a rule or compound metric"?
As stated in the user manual, you cannot delete a metric if it has been used at least once. Here is an excerpt from Monitor Solution User Manual : "Important: Only metrics that have not been used by any rule or compound metric can be deleted. After a metric has been used, even if the rule that used the metric is disabled or the metric is no longer in use, the metric cannot be deleted".