sijie opened a new issue #6046: [Broker] Expose lastConsumedTimestamp and lastAckedTimestamp to subscription stats URL: https://github.com/apache/pulsar/issues/6046 *Motivation* Currently, `msgBacklog` measures the number of messages that a subscription has not consumed and it is an *estimated* value. It is hard to tell the difference between a backlog estimate being wrong and messages being otherwise stuck. It would be great to expose `lastConsumedTimestamp` and `lastAckedTimestamp` to measure the activities of dispatch and acknowledge. So people can use these timestamps to tell if acknowledge and consumption are happening. These two metrics provide a `lag` metric similar to Kafka. Related Tasks: #5721
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