Why am I seeing this WARN message in the Data Aggregators karaf.log

Document ID : KB000016887
Last Modified Date : 14/02/2018
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Question:

Why am I seeing this WARN message the in the Data Aggregators Karaf.log:

WARN  | Session Task-810 | 2013-01-02 13:52:09,062 | DCHeartBeatLog | ore.collector.interfaces | 

      | HeartBeat message not received.  Expected: 93, Received: 255

Environment:
PM all versions
Answer:

After relocating a Data Collector to another host, the old Data Collector happens to start accidentally causing the SNMP data to be polled twice. This warning is created in the Data Aggregators karaf.log.

To resolve this, you must either stop or uninstall the old Data Collector.

Additional Information:

https://docops.ca.com/ca-performance-management/3-2/en/administrating/data-aggregator-administration/update-the-data-collector