feat(gpu-health-monitor): debounce DCGM connectivity transitions by ymygogogo · Pull Request #1765 · NVIDIA/NVSentinel

ymygogogo · 2026-09-08T10:16:06Z

Summary

This change:

requires consecutive DCGM connectivity failures before publishing GpuDcgmConnectivityFailure;
requires consecutive successful checks before publishing recovery;
resets the failure streak after a successful check;
resets the recovery streak after a failed check;
preserves the initial healthy baseline behavior;
exposes the current failure and success streaks through Prometheus metrics;
defaults to failureThreshold: 3 and successThreshold: 1.

The startup-gating portion of this work was merged separately in #1756.

Closes #1642

Type of Change

Component(s) Affected

Testing

Tests pass locally
Manual testing completed
No breaking changes (or documented)

Checklist

Self-review completed
Documentation updated (if needed)
Ready for review

Summary by CodeRabbit

New Features
- Added configurable DCGM connectivity debouncing for GPU health monitoring.
- Connectivity failures are reported after three consecutive failures by default; recovery requires one consecutive success.
- Added Prometheus metrics for consecutive connectivity observations.
- Added validation requiring thresholds to be positive whole numbers.
Documentation
- Documented configuration options, default behavior, metric reporting, restart behavior, and interactions with health-monitoring safeguards.
Tests
- Added coverage for custom thresholds, invalid values, streak resets, recovery behavior, and event delivery retries.

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coderabbitai · 2026-09-08T10:17:25Z

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Reviewing files that changed from the base of the PR and between fda1cdb and 366e5b7.

📒 Files selected for processing (3)

distros/kubernetes/nvsentinel/charts/gpu-health-monitor/values.yaml
distros/kubernetes/nvsentinel/values-full.yaml
health-monitors/gpu-health-monitor/gpu_health_monitor/cli.py

🚧 Files skipped from review as they are similar to previous changes (1)

distros/kubernetes/nvsentinel/values-full.yaml

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📝 Walkthrough

Walkthrough

The change adds configurable DCGM connectivity debounce thresholds. Helm values and templates validate and render the thresholds. The CLI forwards them to the platform connector, which tracks observation streaks, gates events, exposes metrics, and validates behavior through tests.

Changes

DCGM connectivity debounce

Layer / File(s)	Summary
Helm configuration and validation `distros/kubernetes/nvsentinel/charts/gpu-health-monitor/...`, `distros/kubernetes/nvsentinel/values-full.yaml`	Helm values define failure and success thresholds. Templates validate positive whole numbers and render the `[dcgmconnectivity]` section. Helm tests cover default, custom, and invalid values.
CLI threshold wiring `health-monitors/gpu-health-monitor/gpu_health_monitor/cli.py`	The CLI reads, validates, logs, and forwards both thresholds to each event processor.
Runtime debounce state and metrics `health-monitors/gpu-health-monitor/gpu_health_monitor/platform_connector/platform_connector.py`, `health-monitors/gpu-health-monitor/gpu_health_monitor/platform_connector/metrics.py`	The platform connector tracks consecutive failures and successes, gates failure and recovery events, resets opposing streaks, and publishes observation metrics.
Runtime behavior validation `health-monitors/gpu-health-monitor/gpu_health_monitor/tests/test_platform_connector/test_platform_connector.py`	Tests cover threshold gating, streak resets, initial healthy events, retries, duplicate suppression, and invalid thresholds.
Configuration documentation `docs/configuration/gpu-health-monitor.md`	Documentation describes threshold behavior, validation, restart semantics, metrics, and interactions with related runtime controls.

Estimated code review effort: 3 (Moderate) | ~25 minutes

Merge Risk: 🟡 Moderate · up to 366e5

By default, DCGM connectivity failures will now require three failed checks before an unhealthy event is emitted, which can delay alerting and remediation compared with the documented legacy behavior. Resolve or explicitly accept this default-behavior change before merging.

Suggested reviewers: lfriedman-netllama, xrfxlp

Sequence Diagram(s)

sequenceDiagram
  participant CLI
  participant PlatformConnectorEventProcessor
  participant PrometheusGauge
  participant HealthEventSender
  CLI->>PlatformConnectorEventProcessor: provide connectivity thresholds
  PlatformConnectorEventProcessor->>PrometheusGauge: update consecutive observation count
  PlatformConnectorEventProcessor->>HealthEventSender: publish event when threshold is met

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Linked Issues check	⚠️ Warning	The PR implements runtime DCGM debounce configuration, streak tracking, event suppression, metrics, Helm rendering, tests, and documentation. However, linked issue `#1642` requires default thresholds of…	Set the default failure threshold to 1 to satisfy issue `#1642`, or update the linked issue requirements and all related documentation and tests if a default of 3 is now intended.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly identifies the GPU health monitor feature and its main change: debouncing DCGM connectivity transitions.
Out of Scope Changes check	✅ Passed	The changes remain within the runtime DCGM connectivity debounce scope. The configuration, metrics, tests, Helm templates, values, and documentation directly support the stated objectives. No unrelate…
Docstring Coverage	✅ Passed	Docstring coverage is 80.00% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 15 functions across 4 files. (2 skipped: 2 …

Full details: Linked Issues check

Explanation

The PR implements runtime DCGM debounce configuration, streak tracking, event suppression, metrics, Helm rendering, tests, and documentation. However, linked issue #1642 requires default thresholds of 1 failure and 1 success, while this PR sets the failure default to 3. Startup-gating requirements are explicitly identified as separate work in PR #1756.

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Actionable comments posted: 2

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Inline comments:
In `@distros/kubernetes/nvsentinel/charts/gpu-health-monitor/values.yaml`:
- Line 77: Add an inline example next to the runtimeDebounce configuration in
the values.yaml, showing both coupled failure and recovery thresholds with
non-default values. Keep the example clearly commented so it does not alter
defaults or chart behavior.

In `@health-monitors/gpu-health-monitor/gpu_health_monitor/cli.py`:
- Line 268: Update the connectivity_failure_threshold fallback in the CLI
configuration flow to use 3 when the [dcgmconnectivity] section is absent,
preserving the documented requirement of three consecutive failures before
publishing an unhealthy event.

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📥 Commits

Reviewing files that changed from the base of the PR and between 9c8c0de and fda1cdb.

📒 Files selected for processing (10)

distros/kubernetes/nvsentinel/charts/gpu-health-monitor/templates/_helpers.tpl
distros/kubernetes/nvsentinel/charts/gpu-health-monitor/templates/configmap.yaml
distros/kubernetes/nvsentinel/charts/gpu-health-monitor/tests/dcgm_runtime_debounce_test.yaml
distros/kubernetes/nvsentinel/charts/gpu-health-monitor/values.yaml
distros/kubernetes/nvsentinel/values-full.yaml
docs/configuration/gpu-health-monitor.md
health-monitors/gpu-health-monitor/gpu_health_monitor/cli.py
health-monitors/gpu-health-monitor/gpu_health_monitor/platform_connector/metrics.py
health-monitors/gpu-health-monitor/gpu_health_monitor/platform_connector/platform_connector.py
health-monitors/gpu-health-monitor/gpu_health_monitor/tests/test_platform_connector/test_platform_connector.py

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Signed-off-by: yumy <yumy@zetyun.com>

ymygogogo · 2026-09-08T10:35:24Z

Hi @lalitadithya, the runtime connectivity debounce PR is ready for review. The startup gate was merged separately in #1756.

lalitadithya · 2026-09-08T10:38:07Z

/ok to test 366e5b7

github-actions · 2026-09-08T10:41:58Z

🌿 Fern Docs Preview: https://nvidia-preview-pull-request-1765.docs.buildwithfern.com/nvsentinel

coderabbitai Bot reviewed Sep 8, 2026

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Comment thread distros/kubernetes/nvsentinel/charts/gpu-health-monitor/values.yaml

Comment thread health-monitors/gpu-health-monitor/gpu_health_monitor/cli.py Outdated

feat(gpu-health-monitor): debounce DCGM connectivity transitions

366e5b7

Signed-off-by: yumy <yumy@zetyun.com>

ymygogogo force-pushed the gpu-health-monitor-dcgm-runtime-debounce branch from fda1cdb to 366e5b7 Compare September 8, 2026 10:26

lalitadithya requested a review from deesharma24 September 8, 2026 10:38

github-actions Bot added area/docs area/deployment area/health-monitors size/L labels Sep 8, 2026

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feat(gpu-health-monitor): debounce DCGM connectivity transitions - #1765

feat(gpu-health-monitor): debounce DCGM connectivity transitions#1765
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