feat: Add an ability to measure clusters with dns only control plane

[matix522]

…access

This update allows ClusterLoader2 to target clusters using a DNS endpoint for the control plane. It includes support for the MASTER_DNS_ENDPOINT environment variable and relevant configuration changes. Changed logging to show all of the Node adresses to allow for dualstack clusters.

What type of PR is this?

/kind feature

What this PR does / why we need it:

This PR is needed by the GKE team to test the performance of clusters that use DNS address instead of IP address for cluster control plane

Special notes for your reviewer:

[k8s-ci-robot]

Hi @matix522. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[matix522]

/kind feature

[mborsz]

/ok-to-test

[mborsz]

/lgtm
/approve

[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: matix522, mborsz

The full list of commands accepted by this bot can be found here.

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Needs approval from an approver in each of these files:

• clusterloader2/OWNERS [mborsz]

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[matix522]

/retest

[matix522]

/retest

[k8s-ci-robot]

New changes are detected. LGTM label has been removed.

[matix522]

/retest

[k8s-ci-robot]

@matix522: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
pull-perf-tests-clusterloader2	9e2edca	link	true	/test pull-perf-tests-clusterloader2
pull-perf-tests-gce-master-scale-performance-100	9e2edca	link	true	/test pull-perf-tests-gce-master-scale-performance-100
pull-perf-tests-ec2-master-scale-performance-100	9e2edca	link	true	/test pull-perf-tests-ec2-master-scale-performance-100
pull-perf-tests-clusterloader2-kubemark	9e2edca	link	true	/test pull-perf-tests-clusterloader2-kubemark

Full PR test history. Your PR dashboard. Please help us cut down on flakes by linking to an open issue when you hit one in your PR.

Details

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-sigs/prow repository. I understand the commands that are listed here.