Hi, I open a new PIP to introduce pending publish buffer usage metrics. In the past, we introduced broker side backpressure to protect the broker, but we don't have any metrics to track the publish buffer usage. This PIP is to complete it.
PIP link: https://github.com/apache/pulsar/pull/24028 Implementation: https://github.com/apache/pulsar/pull/23751 Thanks, Tao Jiuming
