Hi, PIP-323 is introduced to fill the gap of backlog quota telemetry. It allows the user to know when a time-based backlog quota is about to exceed, and how many times it exceeded. It also adds backlog quota check duration metric allowing the user to configure the interval for that check based on data. Once this is implemented, the user can finally create an alert to know when a certain topic is about to exceed its defined backlog quota limit, alert on it, and use topic stats Admin API to grab the subscription name causing it.
PIP link: https://github.com/apache/pulsar/pull/21709 This picks up PIP-248 <https://github.com/apache/pulsar/issues/19601> which was left stale and unapproved, improves it a bit and will implement once approved. Thanks, Asaf Mesika
