[Bug]: NIC generates AddedOrUpdated events for unchanged mergeable ingress resources

[dareste]

Version

3.7.0

What Kubernetes platforms are you running on?

Other

Steps to reproduce

1. Deploy a structure of mergeable ingress resources with 1 master and 500 minions.
2. Change one of the minions.
3. Watch the AddedOrUpdated events not only for the changed minion, but for all the minions and the master ingress resource.

The events can be observed both in the NIC logs, or in k8s via the kubectl get events -w command. In the logs, such events will appear immediately after the change. The events, however, will be slowly populated and the stream will last for ~3m (see attached file - this might change depending on the platform tested). During that time, nginx-ingress binary will show a slightly higher CPU usage when compared to the baseline.

Moreover, by comparing the resourceVersion values of the 501 objects, it can be confirmed that the only altered value belongs to the modified minion.

k8s-events-500-minions.txt

[github-actions]

Hi @dareste thanks for reporting!

Be sure to check out the docs and the Contributing Guidelines while you wait for a human to take a look at this 🙂

Cheers!