Kafka node offline causes consumer group queries to fail entirely

[cobolbaby]

Description
When a single Kafka broker/node goes offline, querying consumer group information results in complete failure instead of partial degradation or graceful handling.

Steps to Reproduce

1. Set up a Kafka cluster with multiple brokers.
2. Create a topic and a consumer group consuming from it.
3. Shut down one Kafka broker (simulate node failure).
4. Run consumer group query commands

Expected Behavior

• Consumer group queries should still return available information from remaining brokers.

Actual Behavior

• All consumer group queries fail when one broker is offline.

{
    "statusCode": 404,
    "message": "Failed to get consumer group lags: failed to list end offsets for topics: request ListOffsets has 1 separate shard errors, first: LISTENER_NOT_FOUND: There is no listener on the leader broker that matches the listener on which metadata request was processed."
}

Impact

• Affects observability and troubleshooting during partial cluster failures.
• Makes it difficult to monitor lag and consumer status in degraded scenarios.

Environment

• Kafka version: 2.x / 3.x
• Deployment mode: Kubernetes