chore(defaultevictor): add MatchExpressions compatibility to the namespaceselector by Fankhauserli · Pull Request #1853 · kubernetes-sigs/descheduler

Fankhauserli · 2026-03-19T09:15:19Z

Description

We noticed that the new NamespaceLabelSelector does not implement the MatchExpressions selector. This is vital for our workflow, as we need to use an exclusion label with a MatchExpression.

Our target configuration looks something like this:

matchExpressions: 
  - key: "deschedulerExclusion"
    operator: "NotIn"
    values: ["true"]

Currently, the descheduler only checks for MatchLabels:

if ev.args.NamespaceLabelSelector == nil || len(ev.args.NamespaceLabelSelector.MatchLabels) == 0 {}

This Pull Request updates the condition to account for MatchExpressions as well, and adds the corresponding tests to ensure the new behavior works as expected.

if ev.args.NamespaceLabelSelector != nil && (len(ev.args.NamespaceLabelSelector.MatchLabels) > 0 || len(ev.args.NamespaceLabelSelector.MatchExpressions) > 0) {}

Checklist

Please ensure your pull request meets the following criteria before submitting
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completeness of your changes:

linux-foundation-easycla · 2026-03-19T09:15:27Z

The committers listed above are authorized under a signed CLA.

✅ login: Fankhauserli / name: Linus Fankhauser (2348014, 95154ad)

k8s-ci-robot · 2026-03-19T09:15:29Z

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k8s-ci-robot · 2026-03-19T09:15:30Z

Hi @Fankhauserli. Thanks for your PR.

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a7i · 2026-03-25T01:51:27Z

/ok-to-test

a7i · 2026-04-08T02:11:56Z

/lgtm

ingvagabund · 2026-05-11T10:13:34Z

 	})

-	fakeClient := fake.NewClientset(node, nsProd, nsBackend, nsTest, podInProd, podInBackend, podInTest)
+	fakeClient := fake.NewSimpleClientset(node, nsProd, nsBackend, nsTest, podInProd, podInBackend, podInTest)


Is this intentional? The newly written tests use NewSimpleClientset.

ingvagabund · 2026-05-11T10:18:19Z

+
+	fakeClient := fake.NewClientset(node, nsProd, nsTest, podInProd, podInTest)
+	sharedInformerFactory := informers.NewSharedInformerFactory(fakeClient, 0)
+	getPodAssignedToNode, _ := podutil.BuildGetPodsAssignedToNodeFunc(sharedInformerFactory.Core().V1().Pods().Informer())


Probably rare to fail here but still good practice to check the error

ingvagabund · 2026-05-11T10:24:07Z

+	testCases := []struct {
+		name    string
+		args    *DefaultEvictorArgs
+		results map[string]bool // pod name -> should pass PreEvictionFilter


What about to create a list of pointers to pods to pass and not pass to make the selection more explicit instead of constructing it at the end? To make the test easier to read.

ingvagabund · 2026-05-11T10:27:46Z

+	nsNoLabels.Labels = map[string]string{}
+
+	podInProd := test.BuildTestPod("pod-in-prod", 100, 100, node.Name, func(pod *v1.Pod) {
+		pod.Namespace = "ns-prod"


pod.Namespace = nsProd.Name to avoid duplicating the string literal. The same for other occurences.

ingvagabund · 2026-05-11T10:31:30Z

+	nsNoLabels := test.BuildTestNamespace("ns-nolabels")
+	nsNoLabels.Labels = map[string]string{}
+
+	podInProd := test.BuildTestPod("pod-in-prod", 100, 100, node.Name, func(pod *v1.Pod) {


s/podInProd/podInProdFrontend to make it explicit. The same for other occurences.

ingvagabund · 2026-05-11T10:32:32Z

+	defer cancel()
+	node := test.BuildTestNode("node1", 1000, 2000, 10, nil)
+
+	podProd := test.BuildTestPod("pod-prod", 100, 100, node.Name, func(pod *v1.Pod) {


ditto. s/podProd/podProdFrontend and other occurences

ingvagabund · 2026-05-11T10:32:40Z

+	testCases := []struct {
+		name    string
+		args    *DefaultEvictorArgs
+		results map[string]bool // pod name -> should pass Filter


ingvagabund · 2026-05-11T10:34:26Z

The first commit introduces a lot of test code that is then removed/updated in the second commit. Can you please either squash the commits or make the new tests part of a single commit?

ingvagabund · 2026-05-11T10:34:59Z

@Fankhauserli thank you for the code changes and welcome as a contributor

…selector

ingvagabund · 2026-05-18T11:14:43Z

/approve
/lgtm

k8s-ci-robot · 2026-05-18T11:14:52Z

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ingvagabund

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…escheduler (0.35.1 ➔ 0.36.0) (#586) This PR contains the following updates: | Package | Update | Change | |---|---|---| | [ghcr.io/home-operations/charts-mirror/descheduler](https://github.com/kubernetes-sigs/descheduler) | minor | `0.35.1` → `0.36.0` | --- ### Release Notes <details> <summary>kubernetes-sigs/descheduler (ghcr.io/home-operations/charts-mirror/descheduler)</summary> ### [`v0.36.0`](https://github.com/kubernetes-sigs/descheduler/releases/tag/v0.36.0): Descheduler v0.36.0 [Compare Source](kubernetes-sigs/descheduler@v0.35.1...v0.36.0) #### What's Changed - fix(ci): pin helm-unittest plugin version and bump chart-testing-action by [@a7i](https://github.com/a7i) in [#1834](kubernetes-sigs/descheduler#1834) - Update helm RBAC to account for pvc failure on 0.35.0 by [@cayla](https://github.com/cayla) in [#1836](kubernetes-sigs/descheduler#1836) - Add init containers support to Helm chart by [@kamleshjoshi8102](https://github.com/kamleshjoshi8102) in [#1826](kubernetes-sigs/descheduler#1826) - Change icon URL in Chart.yaml by [@a7i](https://github.com/a7i) in [#1838](kubernetes-sigs/descheduler#1838) - fix: resolve detected data races by [@ingvagabund](https://github.com/ingvagabund) in [#1842](kubernetes-sigs/descheduler#1842) - fix(ci): upgrade codeql-action to v4 and clean up security workflow by [@a7i](https://github.com/a7i) in [#1847](kubernetes-sigs/descheduler#1847) - update golang semconv dependencies by [@sammedsingalkar09](https://github.com/sammedsingalkar09) in [#1848](kubernetes-sigs/descheduler#1848) - Extend PodLifeTime with condition, exit code, owner kind, and transition time filters by [@a7i](https://github.com/a7i) in [#1844](kubernetes-sigs/descheduler#1844) - security: Update trivy-action to use sha for v0.35.0 by [@Priyankasaggu11929](https://github.com/Priyankasaggu11929) in [#1854](kubernetes-sigs/descheduler#1854) - security: upgrade grpc and otel sdk dependencies by [@sammedsingalkar09](https://github.com/sammedsingalkar09) in [#1859](kubernetes-sigs/descheduler#1859) - evictions: fix missing observability for background evictions by [@tiraboschi](https://github.com/tiraboschi) in [#1856](kubernetes-sigs/descheduler#1856) - fix(descheduler): reset prometheus usage client at each extension point by [@tiraboschi](https://github.com/tiraboschi) in [#1862](kubernetes-sigs/descheduler#1862) - fix(.github/workflows/manifests.yaml): pin actions to a sha by [@ingvagabund](https://github.com/ingvagabund) in [#1868](kubernetes-sigs/descheduler#1868) - cloudbuild: pin gcb-docker-gcloud image by digest by [@Paramesh324](https://github.com/Paramesh324) in [#1871](kubernetes-sigs/descheduler#1871) - chart: allow overriding ServiceMonitor apiVersion by [@a7i](https://github.com/a7i) in [#1837](kubernetes-sigs/descheduler#1837) - ci: pin GitHub Actions to immutable SHAs by [@a7i](https://github.com/a7i) in [#1875](kubernetes-sigs/descheduler#1875) - evictions: fix assumePod silently dropping success metric on informer race by [@tiraboschi](https://github.com/tiraboschi) in [#1873](kubernetes-sigs/descheduler#1873) - chore(defaultevictor): add MatchExpressions compatibility to the namespaceselector by [@Fankhauserli](https://github.com/Fankhauserli) in [#1853](kubernetes-sigs/descheduler#1853) - fix(test/setupTestSandbox): wait until initial objects are propagated to informers by [@ingvagabund](https://github.com/ingvagabund) in [#1878](kubernetes-sigs/descheduler#1878) - \[v0.36.0] release prep: bump k8s/go deps, manifests, docs, and CI matrix by [@a7i](https://github.com/a7i) in [#1874](kubernetes-sigs/descheduler#1874) #### New Contributors - [@kamleshjoshi8102](https://github.com/kamleshjoshi8102) made their first contribution in [#1826](kubernetes-sigs/descheduler#1826) - [@Priyankasaggu11929](https://github.com/Priyankasaggu11929) made their first contribution in [#1854](kubernetes-sigs/descheduler#1854) - [@Paramesh324](https://github.com/Paramesh324) made their first contribution in [#1871](kubernetes-sigs/descheduler#1871) - [@Fankhauserli](https://github.com/Fankhauserli) made their first contribution in [#1853](kubernetes-sigs/descheduler#1853) **Full Changelog**: <kubernetes-sigs/descheduler@v0.35.0...v0.36.0> </details> --- ### Configuration 📅 **Schedule**: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined). 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this PR and you won't be reminded about this update again. --- - [ ] If you want to rebase/retry this PR, check this box --- This PR has been generated by [Renovate Bot](https://github.com/renovatebot/renovate).  Reviewed-on: https://git.erwanleboucher.dev/eleboucher/homelab/pulls/586

…uler ( 0.35.1 ➔ 0.36.0 ) (#85) This PR contains the following updates: | Package | Update | Change | |---|---|---| | [ghcr.io/home-operations/charts-mirror/descheduler](https://github.com/kubernetes-sigs/descheduler) | minor | `0.35.1` → `0.36.0` | --- > ⚠️ **Warning** > > Some dependencies could not be looked up. Check the [Dependency Dashboard](issues/34) for more information. --- ### Release Notes <details> <summary>kubernetes-sigs/descheduler (ghcr.io/home-operations/charts-mirror/descheduler)</summary> ### [`v0.36.0`](https://github.com/kubernetes-sigs/descheduler/releases/tag/v0.36.0): Descheduler v0.36.0 [Compare Source](kubernetes-sigs/descheduler@v0.35.1...v0.36.0) #### What's Changed - fix(ci): pin helm-unittest plugin version and bump chart-testing-action by [@a7i](https://github.com/a7i) in [#1834](kubernetes-sigs/descheduler#1834) - Update helm RBAC to account for pvc failure on 0.35.0 by [@cayla](https://github.com/cayla) in [#1836](kubernetes-sigs/descheduler#1836) - Add init containers support to Helm chart by [@kamleshjoshi8102](https://github.com/kamleshjoshi8102) in [#1826](kubernetes-sigs/descheduler#1826) - Change icon URL in Chart.yaml by [@a7i](https://github.com/a7i) in [#1838](kubernetes-sigs/descheduler#1838) - fix: resolve detected data races by [@ingvagabund](https://github.com/ingvagabund) in [#1842](kubernetes-sigs/descheduler#1842) - fix(ci): upgrade codeql-action to v4 and clean up security workflow by [@a7i](https://github.com/a7i) in [#1847](kubernetes-sigs/descheduler#1847) - update golang semconv dependencies by [@sammedsingalkar09](https://github.com/sammedsingalkar09) in [#1848](kubernetes-sigs/descheduler#1848) - Extend PodLifeTime with condition, exit code, owner kind, and transition time filters by [@a7i](https://github.com/a7i) in [#1844](kubernetes-sigs/descheduler#1844) - security: Update trivy-action to use sha for v0.35.0 by [@Priyankasaggu11929](https://github.com/Priyankasaggu11929) in [#1854](kubernetes-sigs/descheduler#1854) - security: upgrade grpc and otel sdk dependencies by [@sammedsingalkar09](https://github.com/sammedsingalkar09) in [#1859](kubernetes-sigs/descheduler#1859) - evictions: fix missing observability for background evictions by [@tiraboschi](https://github.com/tiraboschi) in [#1856](kubernetes-sigs/descheduler#1856) - fix(descheduler): reset prometheus usage client at each extension point by [@tiraboschi](https://github.com/tiraboschi) in [#1862](kubernetes-sigs/descheduler#1862) - fix(.github/workflows/manifests.yaml): pin actions to a sha by [@ingvagabund](https://github.com/ingvagabund) in [#1868](kubernetes-sigs/descheduler#1868) - cloudbuild: pin gcb-docker-gcloud image by digest by [@Paramesh324](https://github.com/Paramesh324) in [#1871](kubernetes-sigs/descheduler#1871) - chart: allow overriding ServiceMonitor apiVersion by [@a7i](https://github.com/a7i) in [#1837](kubernetes-sigs/descheduler#1837) - ci: pin GitHub Actions to immutable SHAs by [@a7i](https://github.com/a7i) in [#1875](kubernetes-sigs/descheduler#1875) - evictions: fix assumePod silently dropping success metric on informer race by [@tiraboschi](https://github.com/tiraboschi) in [#1873](kubernetes-sigs/descheduler#1873) - chore(defaultevictor): add MatchExpressions compatibility to the namespaceselector by [@Fankhauserli](https://github.com/Fankhauserli) in [#1853](kubernetes-sigs/descheduler#1853) - fix(test/setupTestSandbox): wait until initial objects are propagated to informers by [@ingvagabund](https://github.com/ingvagabund) in [#1878](kubernetes-sigs/descheduler#1878) - \[v0.36.0] release prep: bump k8s/go deps, manifests, docs, and CI matrix by [@a7i](https://github.com/a7i) in [#1874](kubernetes-sigs/descheduler#1874) #### New Contributors - [@kamleshjoshi8102](https://github.com/kamleshjoshi8102) made their first contribution in [#1826](kubernetes-sigs/descheduler#1826) - [@Priyankasaggu11929](https://github.com/Priyankasaggu11929) made their first contribution in [#1854](kubernetes-sigs/descheduler#1854) - [@Paramesh324](https://github.com/Paramesh324) made their first contribution in [#1871](kubernetes-sigs/descheduler#1871) - [@Fankhauserli](https://github.com/Fankhauserli) made their first contribution in [#1853](kubernetes-sigs/descheduler#1853) **Full Changelog**: <kubernetes-sigs/descheduler@v0.35.0...v0.36.0> </details> --- ### Configuration 📅 **Schedule**: (in timezone America/New_York) - Branch creation - At any time (no schedule defined) - Automerge - At any time (no schedule defined) 🚦 **Automerge**: Disabled by config. Please merge this manually once you are satisfied. ♻ **Rebasing**: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox. 🔕 **Ignore**: Close this PR and you won't be reminded about this update again. --- - [ ] If you want to rebase/retry this PR, check this box --- This PR has been generated by [Mend Renovate](https://github.com/renovatebot/renovate).  Reviewed-on: https://git.greyrock.io/greyrock-labs/home-ops/pulls/85

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k8s-ci-robot requested review from JaneLiuL and damemi March 19, 2026 09:15

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anthony-spruyt mentioned this pull request Mar 22, 2026

feat(descheduler): switch namespace exclusions to label selectors anthony-spruyt/spruyt-labs#641

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chore(defaultevictor): add matchlabels compatibility to the namespace…

dbb7eb4

…selector

Fankhauserli force-pushed the master branch from 95154ad to dbb7eb4 Compare May 18, 2026 09:07

k8s-ci-robot removed the lgtm "Looks good to me", indicates that a PR is ready to be merged. label May 18, 2026

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k8s-ci-robot merged commit 6b5f6b4 into kubernetes-sigs:master May 18, 2026
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clanker-claude Bot mentioned this pull request May 20, 2026

feat(container): update image ghcr.io/home-operations/charts-mirror/descheduler ( 0.35.1 ➔ 0.36.0 ) mrdynamo/home-ops#1607

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anshulg-dep-review Bot mentioned this pull request May 21, 2026

Update Helm release descheduler to v0.36.0 ansg191-lab/anshulg-cluster#3239

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Fankhauserli commented Mar 19, 2026

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