chore: enable gossip for flower and to squelch errors

[fuziontech]

Problem

The celery logs were filled with this error:

{"event": "pidbox command error: AttributeError(\"'NoneType' object has no attribute 'groups'\")", "timestamp": "2024-01-17T23:03:36.230750Z", "logger": "kombu.pidbox", "level": "error", "pid": 9, "tid": 28147 │
│ 3362922816, "exception": "Traceback (most recent call last):\n  File \"/python-runtime/kombu/pidbox.py\", line 102, in dispatch\n    reply = handle(method, arguments)\n  File \"/python-runtime/kombu/pidbox.py\", line 124, in handle_cast\n    return  │
│ self.handle(method, arguments)\n  File \"/python-runtime/kombu/pidbox.py\", line 118, in handle\n    return self.handlers[method](self.state, **arguments)\n  File \"/python-runtime/celery/worker/control.py\", line 340, in enable_events\n    if dispa │
│ tcher.groups and 'task' not in dispatcher.groups:\nAttributeError: 'NoneType' object has no attribute 'groups'"}

After doing a bit of research it turns out this is related to gossip and flower collecting stats on the workers. I turned this on in K8s and the errors went a way and Flower was happy.

Note: This does increase utilization on redis some, but it should be fine at our levels (only 24 workers max right now)

Note2: We are currently running with gossip enabled manually on prod, probably should be everywhere unless there is a reason not to. It is the default for our version of celery.

Changes

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[webjunkie]

I merged this since I saw these errors all over the place.

I'm wondering if we do need to enable events as well, like explained here
sumitasok/celery#5

Or is the gossip now enough 🤔