runq_overload alert on using MongoDB for authz/authn and also alert gets stuck for days sometimes about emqx

[zmstone]

I do not believe this is a bug, hence we should continue the discussion in the original discussion thread:
#13188

[qzhuyan]

just to be clear, runq_overload is for monitoring/alerting.
We do not expect runq_overload alert from a healthy system.
We do expect raising/clearing runq_overload alert on a resource tight system and it is a sign of resource saturation.

This issue report is about runq_overload alert is not cleared when the system is not overloaded. refer to #13188 (reply in thread)

[chaymankala]

Yes, but also I feel like there is some problem with mongoDB authn/authz plugins, because when I was using EMQX 4, there was no issue like this. Even when I scaled up Im getting alerts only when I enable authn and authz on MongoDB only. Please check if there is any issue in auth plugins with MongoDB, this is very critical for our system.