Exporter no longer compatible with Kafka broker 2.x (due to Kraft)

[tgaudillat02]

Describe the bug
Since the Kafka connector was update to 3.x, the exporter is no longer compatible with broker 2.x due to Kraft connection.
Here the error during connexion :

2023-04-28 13:11:32,933 DEBUG o.a.k.clients.admin.KafkaAdminClient akka://kafka-lag-exporter/user/consumer-group-collector-perf3 - [AdminClient clientId=adminclient-2] Call(callName=describeGroups(api=FIND_COORDINATOR), deadlineMs=1682687502932, tries=1, nextAllowedTryMs=1682687493933) failed with non-retriable exception after 1 attempt(s) java.lang.Exception: NoBatchedFindCoordinatorsException: Cannot create a v3 FindCoordinator request because we require features supported only in 4 or later.
	at org.apache.kafka.clients.admin.KafkaAdminClient$Call.fail(KafkaAdminClient.java:819)
	at org.apache.kafka.clients.admin.KafkaAdminClient$AdminClientRunnable.handleResponses(KafkaAdminClient.java:1251)
	at org.apache.kafka.clients.admin.KafkaAdminClient$AdminClientRunnable.processRequests(KafkaAdminClient.java:1416)
	at org.apache.kafka.clients.admin.KafkaAdminClient$AdminClientRunnable.run(KafkaAdminClient.java:1339)
	at java.base/java.lang.Thread.run(Unknown Source)

To Reproduce
Deploy a 2.5.0 Kafka broker and try the 0.8.2 exporter version.

Environment

• 0.8.2
• 2.5.0
• Run with Helm

Additional context
The update was done in the 0.7.2 version of the exporter.

[perdue]

2023-04-28 13:11:32,933 DEBUG o.a.k.clients.admin.KafkaAdminClient akka://kafka-lag-exporter/user/consumer-group-collector-perf3 - [AdminClient clientId=adminclient-2] Call(callName=describeGroups(api=FIND_COORDINATOR), deadlineMs=1682687502932, tries=1, nextAllowedTryMs=1682687493933) failed with non-retriable exception after 1 attempt(s) java.lang.Exception: NoBatchedFindCoordinatorsException: Cannot create a v3 FindCoordinator request because we require features supported only in 4 or later.
	at org.apache.kafka.clients.admin.KafkaAdminClient$Call.fail(KafkaAdminClient.java:819)
	at org.apache.kafka.clients.admin.KafkaAdminClient$AdminClientRunnable.handleResponses(KafkaAdminClient.java:1251)
	at org.apache.kafka.clients.admin.KafkaAdminClient$AdminClientRunnable.processRequests(KafkaAdminClient.java:1416)
	at org.apache.kafka.clients.admin.KafkaAdminClient$AdminClientRunnable.run(KafkaAdminClient.java:1339)
	at java.base/java.lang.Thread.run(Unknown Source)

I can confirm this error. I am seeing the same in the logs with any kafka-lag-exporter version >= 0.7.2.

Environment

• kafka-lag-exporter version >= 0.7.2
  • Running with Docker
• Kafka cluster running Kafka version 2.7.0

[tgaudillat02]

Hello,
Any update ?