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Merged
merged 4 commits into from
Aug 27, 2025
Merged

perf: Add flag to disable costly metrics controllers #2354

merged 4 commits into from
Aug 27, 2025

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@DerekFrank
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@DerekFrank DerekFrank commented Jul 7, 2025 •
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Fixes #N/A

Description

Metrics controllers can cause metric scrape timeouts at scale, this adds an optional feature flag to disable them

How was this change tested?

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By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

@k8s-ci-robot k8s-ci-robot added the cncf-cla: yes Indicates the PR's author has signed the CNCF CLA. label Jul 7, 2025
@k8s-ci-robot k8s-ci-robot requested review from engedaam and tallaxes July 7, 2025 20:37
@k8s-ci-robot k8s-ci-robot added the needs-ok-to-test Indicates a PR that requires an org member to verify it is safe to test. label Jul 7, 2025
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Hi @DerekFrank. Thanks for your PR.

I'm waiting for a kubernetes-sigs 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.

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@k8s-ci-robot k8s-ci-robot added the size/M Denotes a PR that changes 30-99 lines, ignoring generated files. label Jul 7, 2025
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coveralls commented Jul 7, 2025 •
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Pull Request Test Coverage Report for Build 17247219831

Details

  • 18 of 32 (56.25%) changed or added relevant lines in 3 files are covered.
  • 2 unchanged lines in 1 file lost coverage.
  • Overall coverage decreased (-0.04%) to 81.891%
Changes Missing Coverage Covered Lines Changed/Added Lines %
pkg/controllers/controllers.go 0 14 0.0%
Files with Coverage Reduction New Missed Lines %
pkg/controllers/provisioning/scheduling/volumetopology.go 2 84.0%
Totals Coverage Status
Change from base Build 17221693569: -0.04%
Covered Lines: 10609
Relevant Lines: 12955
💛 - Coveralls

tallaxes
tallaxes reviewed Jul 7, 2025
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Would be good to list exactly what would be missing/disabled when this flag is used.

pkg/controllers/controllers.go
nodeclaimdisruption.NewController(clock, kubeClient, cloudProvider),
nodeclaimhydration.NewController(kubeClient, cloudProvider),
nodehydration.NewController(kubeClient, cloudProvider),
status.NewController[*v1.NodeClaim](
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Are these status controllers only responsible for metrics? Anything else would be missing by disabling them? (For example, looks like they also issue transition events ...)

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@DerekFrank DerekFrank Jul 9, 2025

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They do also emit events for finalizers and status condition changes, but I think thats all they emit

@k8s-ci-robot k8s-ci-robot added the needs-rebase Indicates a PR cannot be merged because it has merge conflicts with HEAD. label Jul 26, 2025
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DerekFrank commented Jul 30, 2025

This option will disable all of the metrics that are just observing cluster state:

  • karpenter_node_allocatable
  • karpenter_node_total_pod_requests
  • karpenter_node_total_pod_limits
  • karpenter_node_total_daemon_requests
  • karpenter_node_total_daemon_limits
  • karpenter_node_system_overhead
  • karpenter_node_current_lifetime_seconds
  • karpenter_nodepool_limit
  • karpenter_nodepool_usage
  • karpenter_pod_state
  • karpenter_pod_startup_duration_seconds
  • karpenter_pod_unstarted_time_seconds
  • karpenter_pod_bound_duration_seconds
  • karpenter_pod_unbound_time_seconds
  • karpenter_pod_provisioning_bound_duration_seconds
  • karpenter_pod_provisioning_unbound_time_seconds
  • karpenter_pod_provisioning_startup_duration_seconds
  • karpenter_pod_provisioning_unstarted_time_seconds
  • karpenter_pod_provisioning_scheduling_undecided_time_seconds
  • operator_nodeclaim_status_condition_transition_seconds
  • operator_nodeclaim_status_condition_count
  • operator_nodeclaim_status_condition_current_status_seconds
  • operator_nodeclaim_status_condition_transitions_total
  • operator_nodepool_status_condition_transition_seconds
  • operator_nodepool_status_condition_count
  • operator_nodepool_status_condition_current_status_seconds
  • operator_nodepool_status_condition_transitions_total
  • operator_nodeclass_status_condition_transition_seconds
  • operator_nodeclass_status_condition_count
  • operator_nodeclass_status_condition_current_status_seconds
  • operator_nodeclass_status_condition_transitions_total

@k8s-ci-robot k8s-ci-robot removed the needs-rebase Indicates a PR cannot be merged because it has merge conflicts with HEAD. label Jul 30, 2025
jmdeal
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@k8s-ci-robot k8s-ci-robot added size/L Denotes a PR that changes 100-499 lines, ignoring generated files. and removed size/M Denotes a PR that changes 30-99 lines, ignoring generated files. labels Aug 5, 2025
jmdeal
jmdeal reviewed Aug 6, 2025
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pkg/controllers/controllers.go
metricsnode.NewController(cluster),
nodepoolreadiness.NewController(kubeClient, cloudProvider),
nodepoolregistrationhealth.NewController(kubeClient, cloudProvider),
nodepoolcounter.NewController(kubeClient, cloudProvider, cluster),
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I'm wondering if it would make sense to include the NodePool Counter controller in this set? I could go either way - since it's just propagating information from cluster state it should be relatively cheap, but the cost does scale with the number of nodepools. It is a "cluster state observability" controller though. Did it show up at all in your performance review?

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We were using a relatively small number of nodepools (~12), we didn't see significant performance impact. One thing I want to explore is how exactly the volume of metrics changes as we scale the number of nodes in the cluster

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It seems fine to include it for the time being, and we can re-evaluate if we see significant performance impact.

@DerekFrank DerekFrank force-pushed the disable-metrics-controllers branch from 4de0745 to 5d4436c Compare August 26, 2025 18:34
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jmdeal commented Aug 27, 2025

/lgtm
/approve

@k8s-ci-robot k8s-ci-robot added the lgtm "Looks good to me", indicates that a PR is ready to be merged. label Aug 27, 2025
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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: DerekFrank, jmdeal

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@k8s-ci-robot k8s-ci-robot added the approved Indicates a PR has been approved by an approver from all required OWNERS files. label Aug 27, 2025
@k8s-ci-robot k8s-ci-robot merged commit e74af5c into kubernetes-sigs:main Aug 27, 2025
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jigisha620 pushed a commit to jigisha620/karpenter that referenced this pull request Sep 19, 2025
@DerekFrank @jigisha620
perf: Add flag to disable costly metrics controllers (kubernetes-sigs…
d44fb22 
…#2354)
@DerekFrank DerekFrank mentioned this pull request Oct 9, 2025
Merged
@DerekFrank DerekFrank deleted the disable-metrics-controllers branch October 15, 2025 17:30
harshad3339 added a commit to acquia/karpenter that referenced this pull request Nov 3, 2025
@harshad3339 @DerekFrank
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KCC-2073 | Updating karpenter to 1.8.0 (#6)
2fa2b7b 
* chore: bump go version to 1.24.4 (kubernetes-sigs#2298)

* chore: Only log that the command succeeded when it actually did (kubernetes-sigs#2302)

* fix: Fix bug with MarkForDeletion before creating replacements (kubernetes-sigs#2300)

* perf: Refactor the eviction queue to be multithreaded (kubernetes-sigs#2252)

* docs: Add Bizfly Cloud provider (kubernetes-sigs#2303)

* chore: Bump lifecycle cache expiration to one hour (kubernetes-sigs#2307)

* chore: Use cluster state to check replacement NodeClaim existence (kubernetes-sigs#2308)

* chore(deps): bump github.com/samber/lo from 1.50.0 to 1.51.0 in the go-deps group (kubernetes-sigs#2315)

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* chore: bump operatorpkg (kubernetes-sigs#2314)

* chore(deps): bump the k8s-go-deps group across 1 directory with 4 updates (kubernetes-sigs#2317)

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* chore: Refactor Orchestration Queue and Handle Mark/Unmark Deletion in Queue (kubernetes-sigs#2305)

* chore(deps): bump the k8s-go-deps group with 7 updates (kubernetes-sigs#2326)

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* perf: multithreaded orchestration queue (kubernetes-sigs#2293)

* test: Add nodeclaim name when you have garbage collection (kubernetes-sigs#2333)

* perf: Reduce multiple patch calls in instance termination (kubernetes-sigs#2324)

* fix: add helm rbac for kwok-provider to update finalizers (kubernetes-sigs#2336)

Signed-off-by: Max Cao <[email protected]>

* feat: configure CRD status operator with larger histogram buckets (kubernetes-sigs#2328)

* chore(deps): bump sigs.k8s.io/yaml from 1.4.0 to 1.5.0 in the k8s-go-deps group (kubernetes-sigs#2339)

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* chore(deps): bump github.com/docker/docker from 28.2.2+incompatible to 28.3.0+incompatible in the go-deps group (kubernetes-sigs#2340)

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* fix: Fix re-retrieving object on retry (kubernetes-sigs#2337)

* fix: Fix overriding error with patch call (kubernetes-sigs#2338)

* fix: add missing rlock to disruption queue (kubernetes-sigs#2348)

* test: allow e2e tests to output junit report (kubernetes-sigs#2334)

Signed-off-by: Max Cao <[email protected]>

* docs: Add Oracle Cloud Infrastructure (OCI) provider  (kubernetes-sigs#2342)

* fix: no longer allow the same hostname to take multiple capacity (kubernetes-sigs#2356)

* feat: support auto relaxing min values (kubernetes-sigs#2299)

* fix: update provider ID to ensure that Cloud Provider tests pass (kubernetes-sigs#2363)

* fix: remove unsupported capacity_type label from karpenter_nodeclaims… (kubernetes-sigs#2364)

* fix: update deletionTimestamp on terminating pods when after nodeDeletionTimestamp (kubernetes-sigs#2316)

Co-authored-by: Amanuel Engeda <[email protected]>

* chore: promote ReservedCapacity feature gate to beta (kubernetes-sigs#2365)

* fix: flakiness in expiration tests (kubernetes-sigs#2366)

* test: Bump the termination time for the deletion timestamp (kubernetes-sigs#2367)

* chore(deps): bump github.com/docker/docker from 28.3.0+incompatible to 28.3.1+incompatible in the go-deps group (kubernetes-sigs#2355)

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* fix: pod errors when nodepool requirements filter all instance types (kubernetes-sigs#2341)

* refactor: Create a NopValidator for the disruption testing (kubernetes-sigs#2369)

* chore(deps): bump the go-deps group with 2 updates (kubernetes-sigs#2373)

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* refactor: Update disruption testing from PR comments (kubernetes-sigs#2372)

* feat: (BREAKING) addition of launch timeout for nodeclaim lifecycle (kubernetes-sigs#2349)

* chore: Consider node.kubernetes.io/not-ready:NoExecute as ephemeral (kubernetes-sigs#2265)

* perf: Optimistically delete from the cache after launch (kubernetes-sigs#2380)

* docs: Node Overlay RFC (kubernetes-sigs#2166)

* fix: handle multiple PDBs for the same pod more gracefully (kubernetes-sigs#2379)

* docs: Add IBM Cloud provider (kubernetes-sigs#2396)

Signed-off-by: Josephine Pfeiffer <[email protected]>

* fix: rate limit eviction when PDBs are blocking (kubernetes-sigs#2399)

* feat: Add the Node Overlay CRD (kubernetes-sigs#2296)

* chore: ignore pods that use unsupported provisioner in the storageClass (kubernetes-sigs#2400)

* feat: Add a feature flag for Node Overlay (kubernetes-sigs#2404)

* feat: Add StaticCapacity feature flag (kubernetes-sigs#2405)

* fix(BREAKING): update naming of karpenter_pods_drained_total (kubernetes-sigs#2421)

* fix: pod metrics when pod is terminal (kubernetes-sigs#2417)

* chore: ignore pods that have unbound pvc with volumeBindingMode immediate (kubernetes-sigs#2415)

* docs: static capacity RFC (kubernetes-sigs#2309)

* chore: bump go version to 1.24.6 (kubernetes-sigs#2432)

* feat: Create optional operator arguments to leverage leader lease functionality (kubernetes-sigs#2433)

* chore(deps): bump the go-deps group with 5 updates (kubernetes-sigs#2442)

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* chore(deps): bump actions/checkout from 4.2.2 to 5.0.0 in /.github/actions/install-pyroscope in the action-deps group (kubernetes-sigs#2428)

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* chore(deps): bump the actions-deps group across 1 directory with 2 updates (kubernetes-sigs#2443)

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* chore(deps): bump actions/cache from 4.2.3 to 4.2.4 in /.github/actions/install-deps in the action-deps group (kubernetes-sigs#2425)

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* fix: do not block drifted nodes from being terminated if consolidation is disabled (kubernetes-sigs#2423)

* chore: Pin GH action SHAs for run-bench-test (kubernetes-sigs#2448)

* chore: update operatorpkg (kubernetes-sigs#2455)

* chore: Track NodeClaims in NodePoolState (kubernetes-sigs#2449)

* chore(deps): bump the k8s-go-deps group across 1 directory with 7 updates (kubernetes-sigs#2456)

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* perf: Add flag to disable costly metrics controllers (kubernetes-sigs#2354)

* perf: concurrent reconciles CPU-based scaling (kubernetes-sigs#2406)

* perf: Disruption Queue Retry Duration Scaling (kubernetes-sigs#2411)

* perf: Typed Bucket Scaling (kubernetes-sigs#2420)

* ci: Include K8s version 1.33 and 1.34 in testing (kubernetes-sigs#2465)

* chore: increase MaxInstanceTypes to give cloud-providers more control over instance type truncation (kubernetes-sigs#2430)

* chore(deps): bump the go-deps group with 2 updates (kubernetes-sigs#2461)

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* chore(deps): bump amannn/action-semantic-pull-request from 6.0.1 to 6.1.1 in the actions-deps group (kubernetes-sigs#2462)

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* ci: revert k8s 1.34 addition (kubernetes-sigs#2475)

* fix: Don't schedule a pod with DRA requirements (kubernetes-sigs#2384)

* fix: support arbitrary reserved capacity labels for drift (kubernetes-sigs#2476)

* chore(deps): bump actions/checkout from 4.2.2 to 5.0.0 in /.github/actions/install-prometheus in the action-deps group (kubernetes-sigs#2426)

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* fix: Fix nil pointer exception for multiNodeConsolidation (kubernetes-sigs#2472)

* fix: avoid hash collisions with duplicate match expressions (kubernetes-sigs#2479)

* ci: enable k8s 1.34 tests (kubernetes-sigs#2481)

* fix: Validate unsupported provisioners on bound PVs (kubernetes-sigs#2480)

* refactor: use iterator for iterating state nodes (kubernetes-sigs#2483)

* fix: make toolchain failing due to deletion of asciicheck (kubernetes-sigs#2485)

* fix: Handle PVC edge cases handled by kube-scheduler (kubernetes-sigs#2488)

* chore: Change appName from const to var (kubernetes-sigs#2489)

* fix: Handle unbound volumes with volumeName defined (kubernetes-sigs#2487)

* chore(deps): bump actions/setup-go from 5.5.0 to 6.0.0 in /.github/actions/install-deps in the action-deps group (kubernetes-sigs#2494)

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* chore(deps): bump actions/setup-python from 5.6.0 to 6.0.0 in the actions-deps group (kubernetes-sigs#2493)

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* chore(deps): bump the go-deps group with 6 updates (kubernetes-sigs#2491)

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* chore(deps): bump the k8s-go-deps group with 4 updates (kubernetes-sigs#2492)

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* chore: remove duplicate reconcile logging (kubernetes-sigs#2496)

* chore: bump operatorpkg version (kubernetes-sigs#2500)

* perf: Update the Node Repair Controller for requeue time  (kubernetes-sigs#2286)

* feat: Add NodeOverlay Controller Support (kubernetes-sigs#2306)

* chore(deps): bump the k8s-go-deps group with 3 updates (kubernetes-sigs#2504)

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* chore: rolling back to 1.34 (kubernetes-sigs#2512)

* fix: handle nil selector when hashing in topology (kubernetes-sigs#2511)

* feat: Support Pod Level Resources (kubernetes-sigs#2383)

Signed-off-by: Tsubasa Nagasawa <[email protected]>

* fix: merge limits into requests when constructing ds pods (kubernetes-sigs#2514)

* fix: default CPU_REQUESTS when non-positive value is provided (kubernetes-sigs#2516)

* fix(node): prevent empty providerID causing false NodeClaim matches (kubernetes-sigs#2507)

* feat: Support Static Capacity (kubernetes-sigs#2521)

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: Jason Deal <[email protected]>
Co-authored-by: Jonathan Innis <[email protected]>
Co-authored-by: Andrew Mitchell <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Ryan Mistretta <[email protected]>

* fix: over provisioning static nodeclaims during controller crashes (kubernetes-sigs#2534)

* chore: drop consistency error to info log (kubernetes-sigs#2542)

* fix: flaky static provisioning unit test (kubernetes-sigs#2546)

* fix: nodepool crd definition should explicitly say replicas field as alpha (kubernetes-sigs#2554)

* chore: Update NodeRegistrationHealthy SC to use a buffer mechanism (kubernetes-sigs#2520)

---------

Signed-off-by: dependabot[bot] <[email protected]>
Signed-off-by: Max Cao <[email protected]>
Signed-off-by: Josephine Pfeiffer <[email protected]>
Signed-off-by: Tsubasa Nagasawa <[email protected]>
Co-authored-by: Derek Frank <[email protected]>
Co-authored-by: Jonathan Innis <[email protected]>
Co-authored-by: Lê Minh Quân <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Jigisha Patil <[email protected]>
Co-authored-by: Amanuel Engeda <[email protected]>
Co-authored-by: Max Cao <[email protected]>
Co-authored-by: Aidan Rowe <[email protected]>
Co-authored-by: Daniel Lopes <[email protected]>
Co-authored-by: Saurav Agarwalla <[email protected]>
Co-authored-by: cosimomeli <[email protected]>
Co-authored-by: Jason Deal <[email protected]>
Co-authored-by: Reed Schalo <[email protected]>
Co-authored-by: Josephine Pfeiffer <[email protected]>
Co-authored-by: Sumukha Radhakrishna <[email protected]>
Co-authored-by: Andy Townsend <[email protected]>
Co-authored-by: Sumukha Radhakrishna <[email protected]>
Co-authored-by: ryan-mist <[email protected]>
Co-authored-by: Brandon Wagner <[email protected]>
Co-authored-by: Alima Azamat <[email protected]>
Co-authored-by: Andrew Mitchell <[email protected]>
Co-authored-by: Tsubasa Nagasawa <[email protected]>
Co-authored-by: Neil <[email protected]>
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