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Kafka consumers are typically part of a consumer group. Consumers read data from brokers. Consumers subscribes to one or more topics and consume published messages by pulling data from the brokers.

This test monitors the broker's connection to the consumer and any abnormal connectivity issues can be proactively detected.

Outputs of the test: One set of results for the target Apache Kafka Message System.

Measurement	Description	Measurement Unit	Interpretation
connectionCloseRate	Indicates the rate of closed connections.	Connections/sec
connectionCount	Indicates the current number of active connections.	Number	A very high value is required for this measure.
connectionCreationRate	Indicates the new established connections.	Connections/sec
failedAuthenticationRate	Indicates the connections for failed authentication.	Connections/sec	Ideally, the value of these measures should be zero.
failedReauthentication	Indicates the connections for failed re-authentication.	Connections/sec	Ideally, the value of these measures should be zero.
incomingByteRate	Indicates the average data rate received for a node.	MB/Second
ioTimeNsAvg	Indicates the average length of time for I/O per select call.	Seconds
ioWaitTimeNsAvg	Indicates the average length of time the I/O thread spent waiting for a socket ready for reads or writes.	Seconds
networkIoRate	Indicates the average number of network operations (reads or writes) on all connections.	Seconds
outgoingByteRate	Indicates the average outgoing data rate sent for a node.	MB/Second
reauthenticationLatency	Indicates the average latency observed due to re-authentication.	Milliseconds	A very low value is required for this measure.
requestRate	Indicates the average number of sent requests.	Requests/sec
responseRate	Indicates the average number of received responses.	Responses/sec
selectRate	Indicates the number of times the I/O layer checked for new I/O to perform.	Number/sec