The Consumer Group That StoppedKafka · easy · ~10 minThe fraud-scoring service consumes from transactions. Dashboards show scoring has fallen behind — transactions are being written but not scored. Consumer lag is climbing steadily while the committed offset sits still. The service process is up and its health check is green.Figure out why the group stopped making progress and what to do.Evidence

Metrics

Consumer Logs

Consumer Config

Checkpoints

Committed-offset rate is 0 while producer rate is steady and lag climbs. What does that tell you?

The logs show the member leaving and rejoining every ~30s. What is the root cause?

Once fixed, a healthy consumer clears 5,000 msg/s. With no new input, roughly how many minutes to drain the current 1,200,000-message backlog? (answer in minutes)

What change would you make to fix the loop, and how would you describe this in an interview?