What is consumer lag, how is it calculated, and why is it important for service level agreements?

• A. Lag is the number of unprocessed messages in the broker memory.
• B. Lag is the difference between the consumer's last consumed offset and the earliest offset.
• C. Lag is the amount of time since the last poll.
• D. Lag = difference between the latest log end offset and the consumer's last committed offset. It indicates how far behind a consumer is and helps monitor throughput and latency.

Answer: (D)