+++ This bug was initially created as a clone of Bug #1913096 +++
See upstream bug: https://github.com/kubernetes/kubernetes/issues/95204
Description of problem:
Machine metrics from cadvisor are missing in Kubernetes 1.19+ (OpenShift 4.6+).
I believe OpenShift does not use the machine_* metrics to calculate machine resource stats, instead relying on the stable metrics provided by kube-state-metrics: https://github.com/kubernetes/kubernetes/issues/95204#issuecomment-719445180
However, it is possible our customers are using these metrics directly.
Version-Release number of selected component (if applicable): 4.6+
Expected output from a metrics query:
# kubectl get --raw "/api/v1/nodes/NODE_NAME/proxy/metrics/cadvisor" | grep -i machine_cpu_cores
# HELP machine_cpu_cores Number of CPU cores on the machine.
# TYPE machine_cpu_cores gauge
No matching metrics, as these metrics are not produced.
Patch here: https://github.com/kubernetes/kubernetes/pull/97006
Backport for 1.19: https://github.com/kubernetes/kubernetes/pull/97692
Backport for 1.20: https://github.com/kubernetes/kubernetes/pull/97691
Bumped severity - cadvisor machine metrics will be totally missing on a 4.5 -> 4.6 upgrade without this.
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.
For information on the advisory (OpenShift Container Platform 4.6.20 bug fix update), and where to find the updated
files, follow the link below.
If the solution does not work for you, open a new bug report.