Serialization of kafka metrics failed - Message size to large

Observation

The following warning is seen in HiveMQ logs:

Consequence

Impact: Low (Cosmetic)

Kafka Metrics are not displayed in the Control Center. The Broker and Kafka Extension work otherwise as expected. External Monitoring is not affected either.

Cause

This is a known bug where the size of the Kafka metrics increase beyond the set limit of 5 MB, leading to this error.

Solution

The bug is fixed in HiveMQ version 4.5.5. Please upgrade to this version to resolve this issue.