Under the CEM Setup>Services>EM Configuration tab all Collectors show an "EM Running State" of "Unknown" instead of "Up". What is the significance of the "Unknown".

Document ID : KB000007788
Last Modified Date : 14/02/2018
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Issue:

Under the CEM Setup>Services>EM Configuration tab all Collectors show an "EM Running State" of "Unknown" instead of "Up". What is the significance of the "Unknown"?

Environment:
APM 9.x, 10.x
Cause:
  • When a Collector connects to the APM DB, it provides its port number and a list of IP addresses for all bound Network Interface Cards (NICs) on which it is accepting incoming communications.
  • The Collector IP Address or hostname set in the MOM IntroscopeEnterpriseManager.properties file must match or be resolvable to one of the above IP addresses.¬†If there is no match the Collector status is set to "Unknown" instead of "Up"
Resolution:

An "EM Running State" of "Unknown" may or may not indicate that there is a functionality problem.

For example in a APM cluster failover environment with the following configuration:

  • A Collector registers its NIC IP Addresses with the APM DB and can be succesfully used for assigning CEM Services.
  • A MOM is using a Collector Virtual IP Address (VIP) and can successfully connect to it.

An "Unknown" running state will be reported instead of "Up" because the VIP does not match any of the NIC IPs. However all functionality is working as expected.

Additional Information:

Compare the symptoms/impact of running states "Down" and "Unknown" on this documentation page:

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