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Adds MemoryMonitor/MemoryThrashing intervals for nodes whose major page fault rate stays above 50/s, plus a node_memory_thrashing_intervals autodl table so we can measure how often and how long nodes thrash across CI. In failed runs of e2e-aws-ovn-techpreview, a master short on memory evicted its page cache and re-read ~120 MB/s from disk, stalling the etcd member on it (multi-second fsync/commit) and hanging the local kube-apiserver. Each interval also records the peak page-in rate, which separates mild pressure (a few MB/s) from disk-saturating thrashing. MemoryMonitor is added to interval-duration-sum so every run records a total, including zero, and the timeline chart gets a memory-thrashing row. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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WalkthroughThe change adds CPU saturation and memory thrashing collectors. They create monitor intervals from Prometheus metrics, report results, write autodl data, register monitoring coverage, aggregate durations, and render dedicated E2E chart groups. ChangesResource monitoring
Priority: ➖ Normal Estimated code review effort: 4 (Complex) | ~45 minutes Change: Feature Sequence Diagram(s)sequenceDiagram
participant MonitorCollector
participant Prometheus
participant Kubernetes
participant AutodlStorage
MonitorCollector->>Prometheus: Query resource metrics
MonitorCollector->>Kubernetes: Resolve node metadata
Prometheus-->>MonitorCollector: Return metric samples
Kubernetes-->>MonitorCollector: Return node metadata
MonitorCollector->>MonitorCollector: Create qualifying intervals
MonitorCollector->>AutodlStorage: Write interval data when intervals exist
Merge Risk: ⚪ Minimal · up to
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| Check name | Status | Explanation | Resolution |
|---|---|---|---|
| No-Sensitive-Data-In-Logs |  |
The concern remains unresolved. The new memory collector logs raw collection errors with logger.WithError(err) and copies them into JUnit FailureOutput (monitortest.go:90-95). It logs raw node-l… |
Sanitize collection and node-list errors before logging or writing JUnit FailureOutput. Replace raw Prometheus and Thanos warning logging with fixed operation names and safe error categories. Sanitize the shared Thanos helper path used by… |
| Docstring Coverage |  |
Docstring coverage is 33.33% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 21 functions across 7 files. (2 skipped: … | Write docstrings for the functions missing them to satisfy the coverage threshold. |
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Check name Status Explanation Linked Issues check Check skipped because no linked issues were found for this pull request. Out of Scope Changes check Check skipped because no linked issues were found for this pull request. Stable And Deterministic Test Names No changed Ginkgo test titles were introduced. The added Go tests use static Test...names and statict.Runcase names. The new JUnit test names are fixed constants (`[sig-node] nodes should not b…Test Structure And Quality PASS: The pull request adds or modifies standard Go tests using testing.T,t.Run, andtestify; it does not add GinkgoItblocks. No Ginkgo setup, cleanup, cluster waits, or informing-status ch…Microshift Test Compatibility The pull request adds standard Go unit tests only ( func Test...withtestingandtestify). It adds no Ginkgo e2e tests (It,Describe,Context, orWhen), so the MicroShift API and feature…Single Node Openshift (Sno) Test Compatibility PASS: The pull request adds Go unit tests and monitor-collector logic, not new Ginkgo e2e tests. The added tests use testing.Tand synthetic Prometheus matrices; they do not create pods, schedule wo…Topology-Aware Scheduling Compatibility PASS: The pull request changes only Go monitoring/test code and chart data. The authoritative diff contains no deployment manifests, controllers, operator scheduling code, or scheduling constraints su… Ote Binary Stdout Contract No OTE stdout contract violation was introduced. The reviewed diff adds no main(), init(), TestMain(), suite setup, RunSpecs setup, os.Stdout write, fmt.Print, standard-log stdout write, or klog write… Ipv6 And Disconnected Network Test Compatibility The pull request adds standard Go unit tests ( func Test...), not new Ginkgo e2e tests. The only hardcoded IPv4 value is the10.0.0.5:9100fixture in a unit test. Collector code uses in-cluster Pro…No-Weak-Crypto The pull-request diff adds monitoring, Prometheus queries, interval metadata, and chart filters. It adds no MD5, SHA1, DES, RC4, 3DES, Blowfish, ECB, crypto API, custom crypto, or secret/token compari… Container-Privileges The pull request changes monitoring code, tests, chart HTML, and generated bindata only. The reviewed diff adds no Kubernetes/container manifests and contains none of: privileged, hostPID, hostNetwork… Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title clearly and concisely summarizes the main changes: adding memory thrashing and CPU saturation interval monitoring. Full details: Stable And Deterministic Test Names
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Explanation
No changed Ginkgo test titles were introduced. The added Go tests use static
Test...names and statict.Runcase names. The new JUnit test names are fixed constants ([sig-node] nodes should not be CPU saturatedand[sig-node] nodes should not be thrashing memory); node names and timestamps appear only in test data or failure output, not titles. No legacy metadata prefix tokens appear in the added names.
Full details: Test Structure And Quality
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Explanation
PASS: The pull request adds or modifies standard Go tests using
testing.T,t.Run, andtestify; it does not add GinkgoItblocks. No Ginkgo setup, cleanup, cluster waits, or informing-status changes are in scope.
Full details: Microshift Test Compatibility
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Explanation
The pull request adds standard Go unit tests only (
func Test...withtestingandtestify). It adds no Ginkgo e2e tests (It,Describe,Context, orWhen), so the MicroShift API and feature compatibility check does not apply.
Full details: Single Node Openshift (Sno) Test Compatibility
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Explanation
PASS: The pull request adds Go unit tests and monitor-collector logic, not new Ginkgo e2e tests. The added tests use
testing.Tand synthetic Prometheus matrices; they do not create pods, schedule workloads, inspect cluster topology, or require multiple nodes. Themaster-0andmaster-1values are test metric labels only.
Full details: Topology-Aware Scheduling Compatibility
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Explanation
PASS: The pull request changes only Go monitoring/test code and chart data. The authoritative diff contains no deployment manifests, controllers, operator scheduling code, or scheduling constraints such as affinity, topology spread, node selectors, tolerations, replica strategies, or PDBs. The
masterandworkermatches are node-role metadata used for interval labeling, not workload scheduling.
Full details: Ote Binary Stdout Contract
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Explanation
No OTE stdout contract violation was introduced. The reviewed diff adds no main(), init(), TestMain(), suite setup, RunSpecs setup, os.Stdout write, fmt.Print, standard-log stdout write, or klog write. The logrus calls are inside monitor collector methods and use logrus' normal logging path, not direct stdout output.
Full details: Ipv6 And Disconnected Network Test Compatibility
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Explanation
The pull request adds standard Go unit tests (
func Test...), not new Ginkgo e2e tests. The only hardcoded IPv4 value is the10.0.0.5:9100fixture in a unit test. Collector code uses in-cluster Prometheus and Kubernetes APIs; no public host, external URL, or image pull was added.
Full details: No-Weak-Crypto
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Explanation
The pull-request diff adds monitoring, Prometheus queries, interval metadata, and chart filters. It adds no MD5, SHA1, DES, RC4, 3DES, Blowfish, ECB, crypto API, custom crypto, or secret/token comparison. The added comparisons concern interval sources, reasons, and test names.
Full details: Container-Privileges
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Explanation
The pull request changes monitoring code, tests, chart HTML, and generated bindata only. The reviewed diff adds no Kubernetes/container manifests and contains none of: privileged, hostPID, hostNetwork, hostIPC, SYS_ADMIN, allowPrivilegeEscalation, securityContext, capabilities, or root-user settings.
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Full details: No-Sensitive-Data-In-Logs
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Explanation
The concern remains unresolved. The new memory collector logs raw collection errors with
logger.WithError(err)and copies them into JUnitFailureOutput(monitortest.go:90-95). It logs raw node-list errors (:137) and Prometheus warnings (:175). The collector also newly invokesEnsureThanosQueriersConnectedToPromSidecars, whose shared helper logs raw warnings and wrapped errors (pkg/monitortestlibrary/prometheus/prometheus.go:28-31, 44-47). The CPU change adds another raw run-queue warning log (cpumetriccollector/monitortest.go:173-174) and exposes its query errors through the existing raw collection-error output. These paths may disclose request details, internal hostnames, or other infrastructure data.Resolution
Sanitize collection and node-list errors before logging or writing JUnit
FailureOutput. Replace raw Prometheus and Thanos warning logging with fixed operation names and safe error categories. Sanitize the shared Thanos helper path used by the new collector. Avoid logging raw storage paths and interval strings containing node names; log only fixed filenames, counts, or safe summaries.
Full details: Docstring Coverage
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Explanation
Docstring coverage is 33.33% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 21 functions across 7 files. (2 skipped: 1 unsupported, 1 too large.)
Resolution
Write docstrings for the functions missing them to satisfy the coverage threshold.
✨ Finishing Touches
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Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Inline comments:
Review comments at
@pkg/monitortests/testframework/memorythrashingcollector/monitortest.go:
- Around line 201-223: Update the sample-processing loop that builds thrashing
intervals to check timestamp continuity before extending current. When
qualifying samples are not exactly one queryStep apart, record the existing
interval and start a new one at the current sample; continue updating the
previous timestamp for each sample.
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📒 Files selected for processing: 6
e2echart/e2e-chart-template.htmlpkg/defaultmonitortests/types.gopkg/monitor/monitorapi/types.gopkg/monitortests/testframework/intervaldurationsum/monitortest.gopkg/monitortests/testframework/memorythrashingcollector/monitortest.gopkg/monitortests/testframework/memorythrashingcollector/monitortest_test.go
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Prometheus omits range-query steps that have no value, so qualifying samples on either side of a gap were merged into one interval. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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@coderabbitai Re the pre-merge checks on e7b5c6d:
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Tip For best results, initiate chat on the files or code changes. 🧩 Analysis chain🏁 Script executed: #!/bin/bash
set -euo pipefail
ast-grep outline pkg/monitortests/testframework/memorythrashingcollector/monitortest.go --items all
sed -n '1,230p' pkg/monitortests/testframework/memorythrashingcollector/monitortest.go
rg -n -C 3 '(^//|klog\.|log\.|warnings|Warnings|QueryRange\()' pkg/monitortests/testframework/memorythrashingcollector/monitortest.go
fd -i '(cpu.*metric|etcd.*disk)' pkg/monitortests
rg -n -C 3 'QueryRange\(|klog\.(Error|Warning)|warnings' pkg/monitortests --glob '*go' | head -200Length of output: 33220
No further changes are needed for these two concerns.
You are interacting with an AI system. |
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Chai test selection for
Reason: Additive-only PR: new memory-thrashing-collector monitor test following the cpu-metric-collector pattern. All changes are new code or single-line additions to existing slices/registries; no existing behavior modified. Errors are reported as flakes. GCP e2e verifies the collector integrates cleanly with the monitoring framework. GCP upgrade exercises it during the upgrade scenario that motivated the PR (memory pressure from control-plane operators piling onto one master), and covers the intervaldurationsum tracking addition. /test e2e-gcp-ovn |
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/pipeline mark-pipeline-gate fb5acba |
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Chai test selection for
Reason: Selection unchanged. e2e-gcp-ovn-upgrade passed. e2e-gcp-ovn failed on an unrelated [sig-node] init container liveness probe conformance test; rerunning. The PR is additive-only (new memory-thrashing-collector monitor), no existing behavior modified. /test e2e-gcp-ovn |
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Chai test selection for
Reason: results_settled: all dispatched jobs finished. e2e-gcp-ovn-upgrade passed. e2e-gcp-ovn failed twice on two different unrelated tests (run 1: [sig-node] init container liveness probe; run 2: [sig-network-edge][Feature:IngressOperator] routeSelector matchExpressions). Override justified: 1. Causal overlap: NONE. PR adds a purely additive memory-thrashing-collector monitor test querying Prometheus for node_vmstat_pgmajfault/pgpgin metrics. No networking, ingress, routing, or shared config is modified. The failing tests exercise IngressController route selection and init container lifecycle — zero intersection with memory metric data collection. 2. Fleet instability: [sig-network-edge] routeSelector test has 90.8% pass rate on GCP (8/87 failures, 24/449 overall OVN). No linked bugs. [sig-node] init container test also failed in run 1 with a different mechanism. 3. Coverage: 2161 tests passed in this run. e2e-gcp-ovn-upgrade passed, exercising the same binary/images. The monitor test framework executed. 4. Two different unrelated tests failing across two runs confirms fleet flakiness, not a PR regression. /override-sticky ci/prow/e2e-gcp-ovn |
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@redhat-chai-bot: Overrode contexts on behalf of redhat-chai-bot: ci/prow/e2e-gcp-ovn These overrides will persist across retests on the current HEAD SHA. Pushing a new commit will clear them. Use DetailsIn response to this:
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. |
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Risk analysis has seen new tests most likely introduced by this PR. New Test Risks for sha: fb5acba
New tests seen in this PR at sha: fb5acba
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Bursts of major faults on small pages (a few MB/s paged in) showed no harm across the AWS and GCP runs checked: etcd fsync stayed near 10ms and failing tests had other causes. The two runs where etcd stalled for seconds and the kube-apiserver was restarted read back 120-130 MB/s. Only record an interval when faults exceed 50/s and page-in exceeds 50 MB/s. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Chai test selection for
Reason: This PR adds a new /test e2e-gcp-ovn |
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/pipeline mark-pipeline-gate a530861 |
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/payload-aggregate periodic-ci-openshift-release-main-ci-5.1-e2e-aws-ovn-techpreview 10 |
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@dgoodwin: trigger 1 job(s) for the /payload-(with-prs|job|aggregate|job-with-prs|aggregate-with-prs) command
See details on https://pr-payload-tests.ci.openshift.org/runs/ci/93945310-cbb0-11f1-9ecb-b9f5903a97a1-0 |
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/pipeline mark-pipeline-gate b978f94 |
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Chai test selection for
Reason: Results settled: both selected jobs failed during GCP cluster installation with no e2e test execution. e2e-gcp-ovn (run https://prow.ci.openshift.org/view/gs/test-platform-results-public/pr-logs/pull/31766/pull-ci-openshift-origin-main-e2e-gcp-ovn/2112628191242752000): Failed at /test e2e-gcp-ovn |
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@dgoodwin: The following test failed, say
Full PR test history. Your PR dashboard. DetailsInstructions 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. |
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Risk analysis has seen new tests most likely introduced by this PR. New Test Risks for sha: b978f94
New tests seen in this PR at sha: b978f94
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1 similar comment
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Risk analysis has seen new tests most likely introduced by this PR. New Test Risks for sha: b978f94
New tests seen in this PR at sha: b978f94
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/test e2e-azure-ovn-upgrade |
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/payload-aggregate periodic-ci-openshift-release-main-ci-5.1-e2e-aws-ovn-techpreview 5 |
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@dgoodwin: trigger 2 job(s) for the /payload-(with-prs|job|aggregate|job-with-prs|aggregate-with-prs) command
See details on https://pr-payload-tests.ci.openshift.org/runs/ci/7ec8e760-cd41-11f1-964c-54e2294ba887-0 |
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Risk analysis has seen new tests most likely introduced by this PR. New Test Risks for sha: b978f94
New tests seen in this PR at sha: b978f94
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Risk analysis has seen new tests most likely introduced by this PR. New Test Risks for sha: b978f94
New tests seen in this PR at sha: b978f94
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A payload run on this PR (e2e-aws-ovn plus five e2e-aws-ovn-techpreview runs) flaked the CPU saturation test in all six runs even with must-gather excluded. Techpreview masters spent 40-57 minutes saturated per run versus about 10 on e2e-aws-ovn, and failing runs looked no different from passing ones. Even at a threshold of 8 per core five of six runs would still flake. Drop the flake and the must-gather exclusion. Keep the CPUSaturation intervals (timeline row and interval-duration-sum) so saturation can still be queried per job. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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Chai test selection for
Reason: This PR adds purely additive monitoring code — a new memory thrashing collector and CPU saturation detection in the existing CPU collector — that runs during e2e data collection but does not change any test outcomes (memory thrashing flakes at worst; CPU saturation is interval-only with no JUnit output). All first-stage checks passed (unit tests, build, images, lint, verify, verify-deps). Selected: /test e2e-gcp-ovn |
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/pipeline mark-pipeline-gate 220c513 |
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Risk analysis has seen new tests most likely introduced by this PR. New Test Risks for sha: 220c513
New tests seen in this PR at sha: 220c513
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/payload-aggregate periodic-ci-openshift-release-main-ci-5.1-e2e-aws-ovn-techpreview 10 |
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@dgoodwin: trigger 1 job(s) for the /payload-(with-prs|job|aggregate|job-with-prs|aggregate-with-prs) command
See details on https://pr-payload-tests.ci.openshift.org/runs/ci/aff64a90-ce08-11f1-8558-fab0265823c9-0 |
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@dgoodwin: This pull request references Jira Issue OCPBUGS-131892, which is invalid:
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/jira refresh |
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@dgoodwin: This pull request references Jira Issue OCPBUGS-131892, which is valid. The bug has been moved to the POST state. 3 validation(s) were run on this bug
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Nit - there's maybe some opportunity to dedupe the memory and CPU collectors but overall this looks good to me /lgtm |
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[APPROVALNOTIFIER] This PR is APPROVED This pull-request has been approved by: dgoodwin, stbenjam The full list of commands accepted by this bot can be found here. The pull request process is described here DetailsNeeds approval from an approver in each of these files:
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| for _, sample := range stream.Values { | ||
| samples[sample.Timestamp] = float64(sample.Value) | ||
| } | ||
| pageInByInstance[string(stream.Metric["instance"])] = samples |
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Agent says: retains only one page-in series per instance. With two exporter histories for one node, earlier thrashing disappeared, producing a plain pass and no artifact. Reordering the streams restored detection.
| Step: saturationQueryStep, | ||
| }) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("failed to query run-queue wait per instance: %w", err) |
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Agent says: drops successfully collected high-CPU intervals when the new query fails. The reproducer reduced CPU duration from 60 seconds to zero and removed the correlated failed test, while CPU samples still exported.
Adds intervals for two ways control-plane nodes get into trouble during CI: memory thrashing (a new monitor test plus an autodl table) and CPU saturation (new intervals from the existing CPU monitor test). Memory thrashing reports a flaking test when it's detected, so we can see which jobs hit it and how often without failing jobs. CPU saturation is recorded as intervals only.
Why
In failed runs of
periodic-ci-openshift-release-main-ci-5.1-e2e-aws-ovn-techpreview, one master ran short of memory. It evicted its page cache, then re-read about 120 MB/s from disk, which saturated the disk. The etcd member on that master stalled (WAL fsync and commit p99 of several seconds), the local kube-apiserver hung and was restarted, and many unrelated tests timed out. The root cause, control-plane singleton operators piling onto one master, is tracked in OCPBUGS-131892. Today nothing in CI shows this happening.What it does
memory-thrashing-collectorfollows the same pattern ascpu-metric-collectorandetcd-disk-metrics-intervals: range queries at 30s steps from the start of monitoring.rate(node_vmstat_pgmajfault[1m])andrate(node_vmstat_pgpgin[1m]) / 1024. Runs of samples with more than 50 major faults/s and more than 50 MB/s paged in from disk become aMemoryMonitor/MemoryThrashinginterval on the node. Each sample counts for its full 30s step, so short spikes keep a real duration, and a gap in the samples ends the interval.node_memory_thrashing_intervals: one row per interval withNodeName,NodeRole,StartTime,EndTime,DurationSeconds,PeakMajorFaultsPerSecond,PeakPageInMBPerSecond.MemoryMonitoris added tointerval-duration-sum, so every run records a total (including 0), which separates "no thrashing" from "the monitor didn't run".memory-thrashingrow next tohigh-cpu.CPU saturation
cpu-metric-collectornow also recordsCPUSaturation/CPURunQueueSaturationintervals. CPU usage tops out at 100% and hides how backed up a node is; run-queue wait keeps growing.sum by (instance) (rate(node_schedstat_waiting_seconds_total[1m])) / count by (instance) (node_cpu_seconds_total{mode="idle"}), the CPU-seconds threads spend waiting to run, per second per core. Runs of at least two consecutive samples (one minute) above 4 become an interval, with the same step-based durations and gap handling as memory thrashing.cpu-saturationrow in the timeline (separate fromhigh-cpu, even for the same node), and the high CPU test overlap analyzer only looks atHighCPUUsage, sohigh_cpu_e2e_testsis unaffected.interval-duration-sum) only. See calibration below for why.[sig-network][Feature:Router] The HAProxy router should serve a route that points to two services and respect weightsfailed withetcdserver: request timed outduring an etcd leader election at 13:58:50 UTC. There was no memory thrashing and disks were normal (0.9 ms), but the old leader's master (4 cores) had threads waiting 20–28 CPU-seconds per second, and etcd fsync rose to 30–50 ms. The existing 95%HighCPUUsagethreshold flagged it only from 13:53:40 to 13:55:10; the new intervals cover 13:57:30–13:59:00 with a peak of 6.5 per core.periodic-ci-openshift-release-main-ci-5.1-upgrade-from-stable-5.0-e2e-aws-ovn-upgraderuns also showed saturation on masters in every run, from two causes:oc adm must-gathere2e tests, which run several must-gathers at once on one master and saturate it for 5–10 minutes in nearly every run (load ~166 on 4 cores, ~300 runnable threads, ~68 waiting per core). In one run, 9[sig-cli] oc adm must-gathertests all started at 06:38:14.Calibration
Run against two jobs' gather-extra Prometheus snapshots, over their e2e windows:
Healthy nodes stayed under about 10 major faults/s and 20 MB/s paged in. The 50 MB/s cutoff rests on two severe examples, so the peaks are stored with each interval to revisit it once there's more CI data.
Testing
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