Description of problem:

Component Readiness reveals a potential regression with the following test:

[sig-node][invariant] alert/TargetDown should not be at or above info in ns/kube-system

Currently the test details link is showing 3 recent failures similar to the following:

Jun 12 07:48:09.154 - 58s W namespace/kube-system alert/TargetDown alertstate/firing severity/warning ALERTS

Unknown macro: {alertname="TargetDown", alertstate="firing", job="kubelet", namespace="kube-system", prometheus="openshift-monitoring/k8s", service="kubelet", severity="warning"}

}

This test ran 139 times in the 4 weeks before 4.15 GA and never failed once.  It's failed 3 out of 31 times in the last week (with all the failures since yesterday).

Relevant slack thread: https://redhat-internal.slack.com/archives/C01CQA76KMX/p1718200183009099

It seems that /metrics and /metrics/cadvisor endpoint fell over, and later recovered