For real-time applications, the key metric to monitor is consumer lag — the difference between the latest offset on the broker and the last committed offset by the consumer.
From Kafka Monitoring Guide:
“Consumer lag is the most important metric for real-time applications. It tells you how far behind the consumer is from the latest data in Kafka.”
B relates to replication, not client responsiveness.
C tracks group membership stability, not data delay.
D tracks input throughput, not processing latency.
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