Threshold profile is not triggering a notification.

Document ID : KB000108601
Last Modified Date : 20/08/2018
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we have created a threshold for one group of device and it is showing on the graph but no email sent. Device group: Oracle test group, Threshold on: Global Concurrent Sessions - The total instant number of Global Concurrent Sessions at the moment.
CAPM 3.5
This custom metric was added in a much older version when there was an option to import a mib.
Create a vender cert extension as outlined in the docs for this metric:
Additional Information: