Bug 1972076: jsonnet: Disable cpufreq collector in node_exporter

[bison]

The node_exporter cpufreq collector seems to be causing high load on
some machines with lots of cores. This disables it temporarily as a
workaround until the issue can be addressed upstream. We don't seem
to rely on these metrics anywhere.

See: https://bugzilla.redhat.com/show_bug.cgi?id=1972076

• I added CHANGELOG entry for this change.
• No user facing changes, so no entry in CHANGELOG was needed.

[openshift-ci]

@bison: Bugzilla bug 1972076 is in a bug group that is not in the allowed groups for this repo.
Allowed groups for this repo are:

• qe_staff
• redhat

In response to this:

WIP: Bug 1972076: jsonnet: Disable cpufreq collector in node_exporter

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[simonpasquier]

/lgtm

even though we're not sure that node_exporter is the root cause for the kernel soft locks, it might amplify the issue. The procfs library (used to gather the CPU frequency metrics) reads the values from all CPUs in parallel [1] which creates undesired CPU spikes on nodes with many CPUs (prometheus/node_exporter#1880).

[1] https://github.com/prometheus/procfs/blob/5162bec877a860b5ff140b5d13db31ebb0643dd3/sysfs/system_cpu.go#L163-L174

[openshift-ci]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: bison, simonpasquier

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[simonpasquier]

/retitle Bug 1972076: jsonnet: Disable cpufreq collector in node_exporter

[simonpasquier]

/retest

[simonpasquier]

/bugzilla refresh

[openshift-ci]

@simonpasquier: Bugzilla bug 1972076 is in a bug group that is not in the allowed groups for this repo.
Allowed groups for this repo are:

• qe_staff
• redhat

In response to this:

/bugzilla refresh

Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[openshift-bot]

/retest

Please review the full test history for this PR and help us cut down flakes.

[openshift-ci]

@bison: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
ci/prow/e2e-aws-single-node	ed1d1f6	link	/test e2e-aws-single-node

Full PR test history. Your PR dashboard.

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[bison]

/cherry-pick release-4.8

[openshift-cherrypick-robot]

@bison: new pull request created: #1272

In response to this:

/cherry-pick release-4.8

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