RabbitMQ Overall Consumer Count Issue

[Sameer-Italiya]

Describe the bug

RabbitMQ Version = 4.0.5
Erlang Version = 27.3.4
OS = Ubuntu 22.04

RabbitMQ Overall consumer count shows a difference in the RabbitMQ Management Global Count section and with the rabbitmqctl command line

Reproduction steps

1. Log in to the RabbitMQ MGMT, and on the overview page, the global count section, check the consumers count
2. $ rabbitmqctl list_consumers -q | wc -l check the overall consumers count
3. There is a huge difference on consumers count between mgmt and rabbitmqctl cli

...

Expected behavior

Overall consumer count should be the same between RabbitMQ Mgmt global count and with the rabbitmqctl cli

Additional context

No response

[mkuratczyk]

We would need some reproduction steps/tool, because it's definitely not always like that. At the very minimum, explain which protocols you use and if there's anything special going on. Ideally, provide exact steps to trigger this situation.

[Sameer-Italiya]

Protocol use = amqp/ssl
Client = .Net
Port = 5671

[michaelklishin]

These are not enough to reproduce. We need an executable example.

[mkuratczyk]

ok, but with this amount of information, I'm not sure we'll spend time on this. I ran a few quick tests and the values matched, so there needs to be something specific that triggers that. If you'd like this get fixed, please spend some time trying to debug this a bit further

[Sameer-Italiya]

rabbitmqctl cli provides output is looks correct but the rmq mgmt global count consumers seems provide wrong info so can you please explain how global count consumer count fetch on rmq mgmt so we can check further on this

[mkuratczyk]

Is it possible that you just have many virtual hosts and there are lots of connections/consumers you are not aware of? The Management UI shows the total for all nodes across all vhosts, while rabbitmqctl shows it for a specific vhost (/ by default)

[lukebakken]

For grins I asked the genie (ChatGPT) and your response is the first theory it came up with (link).

[michaelklishin]

@Sameer-Italiya RabbiMQ 4.0 is out of community support.

RabbitMQ does not register consumers (except for shovels and federation links), applications do.
Take and inspect a traffic capture and see whether any of the applications (connections) can be adding new consumers without ever cancelling them (leaking them).

Many CLI commands are scoped per virtual host, while in the management UI you are looking at a global metric across all virtual hosts.

The only relatively recent change related to this metric that I can see is #13198.