Exception while fetching queue length about celery-exporter HOT 8 CLOSED

Can you revert to an earlier release (probably one without queue length metrics) while I have a look at this?

cc @homholueng

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@danihodovic I'll try

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redis "removes" the queue when it's empty, that would explain NOT_FOUND - no queue

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@derom Figure you could resolve this in a PR?

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@abellotti See if danihodovic/celery-exporter:0.5.3 resolves your issue. It worked for my Django project @ https://django.wtf

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Hi @danihodovic the 0.5.3 and latest 0.4.1 tagged release does resolve the issue (no exception being logged), however, the queue lengths are always 0.0, even though I'm creating hundreds of async tasks.

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Hi @abellotti Could you stop celery workers for a few minutes and see if it shows that queues are growing?
Also, I've noticed a change on the queues graph. Not sure how it's related to the update.
The new version of exporter shows "empty queues" with 30s interval, but with 10s, it shows queues as before

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It's working for me with 0.5.3

# HELP celery_queue_length The number of message in broker queue.
# TYPE celery_queue_length gauge
celery_queue_length{queue_name="celery"} 3187.0

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