NadirJ opened a new issue, #15032:
URL: https://github.com/apache/pulsar/issues/15032
**Describe the bug**
I'm monitoring Pulsar and I would like the ability to monitor how many
consumers are connected and subscribing from a given subscription.
Right this metric already exists `pulsar_consumers_count`
It tells how many consumers are connected to a given topic/partition.
If the label `subscription` could be added to this metric then I can
correlate it various subscription metrics like
`pulsar_subscription_back_log` and `pulsar_subscription_msg_rate_out`
Specifically, I'm trying to detect "Stuck" Subscriptions and alert on this
case when it occurs
Here is the sample prometheus alerting rule I need
```
- name: stuck-subscription
rules:
- alert: StuckParitionOrTopic
expr: pulsar_subscription_back_log > 0 and
pulsar_subscription_msg_rate_out == 0 and pulsar_consumers_count > 0
for: 5m
labels:
severity: critical
annotations:
description: Subscription for {{ $labels.topic }} appears to be
stuck.
identifier: '{{ $labels.topic }}'
```
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