Bug 1962172

Summary: Single node CI e2e tests kubelet metrics endpoints intermittent downtime
Product: OpenShift Container Platform Reporter: Omer Tuchfeld <otuchfel>
Component: MonitoringAssignee: Simon Pasquier <spasquie>
Status: CLOSED ERRATA QA Contact: Junqi Zhao <juzhao>
Severity: high Docs Contact:
Priority: unspecified    
Version: 4.8CC: alegrand, anpicker, aos-bugs, erooth, kakkoyun, pkrupa, wking
Target Milestone: ---Keywords: Reopened
Target Release: 4.8.0   
Hardware: Unspecified   
OS: Unspecified   
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Fixed In Version: Doc Type: No Doc Update
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Clone Of: Environment:
Last Closed: 2021-07-27 23:09:14 UTC Type: Bug
Regression: --- Mount Type: ---
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
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Description Flags
Screenshot showing intermittent downtime in the kubelet metrics endpoints none

Description Omer Tuchfeld 2021-05-19 12:55:27 UTC 
Created attachment 1784811 [details]
Screenshot showing intermittent downtime in the kubelet metrics endpoints

Description of problem:
The kubelet metrics endpoints are intermittently unavailable during single-node e2e tests on AWS. See `up = 0` query attached screenshot that shows it quite clearly.

This sometimes causes the TargetDown alert (https://github.com/openshift/cluster-monitoring-operator/blob/30339d233720f96dc3ecaf5059bd150aec6735f6/assets/cluster-monitoring-operator/prometheus-rule.yaml#L16-L30) to be raised.

Version-Release number of selected component (if applicable):
Happened in this nightly
https://prow.ci.openshift.org/view/gcs/origin-ci-test/logs/periodic-ci-openshift-release-master-nightly-4.8-e2e-aws-single-node/1394805313575587840

How reproducible:


Steps to Reproduce:
Happens during single node e2e nightlies https://testgrid.k8s.io/redhat-single-node#periodic-ci-openshift-release-master-nightly-4.8-e2e-aws-single-node

Actual results:
Kubelet metrics endpoints shouldn't have significant downtime

Expected results:
They have significant intermittent downtime


Additional info:
Comment 1 Ryan Phillips 2021-05-20 15:17:34 UTC 
testing pr https://github.com/openshift/kubernetes/pull/755
Comment 6 Junqi Zhao 2021-05-26 01:57:58 UTC 
tested with 4.8.0-0.nightly-2021-05-25-180327, searched with up == 0, did not see kubelet service down within 2 hours
Comment 9 errata-xmlrpc 2021-07-27 23:09:14 UTC 
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 (Moderate: OpenShift Container Platform 4.8.2 bug fix and security 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.

https://access.redhat.com/errata/RHSA-2021:2438