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docs(designs): add ADR-107 for a separate cluster-readiness-engine-crds chart - #551
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…ds chart Helm installs a chart's crds/ directory only on first install, so a plain helm upgrade runs the new controller against the old CRD schema and the API server silently prunes the fields it lacks. nvcrectl works around this; direct Helm, Helmfile and default Flux installs do not. The ADR proposes publishing the CRDs as their own chart, moving the main chart's CRDs into a conditional crds subchart (crds.enabled, default true), adopting existing CRDs with --take-ownership (plus --force-conflicts on Helm 4 where another writer applied them), having nvcrectl skip its CRD apply when a Helm release owns them, and signing the new chart like the main one. It amends ADR-064 decision 1. Status is Proposed, for maintainer review before implementation. Refs #357 Signed-off-by: Kayne Tu <kaynet@nvidia.com>
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📝 Walkthrough
Merge Risk: 🟡 Moderate · up to
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| Check name | Status | Explanation | Resolution |
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| Title check |  |
The title is about adding ADR-107 for a separate cluster-readiness-engine-crds chart. The changeset adds ADR-104 (file docs/designs/104-crds-chart.md) and an index entry, so the ADR number does not ma… | Change the ADR number in the title from ADR-107 to ADR-104 to match docs/designs/104-crds-chart.md and the README index entry. Also check the PR description, which also says ADR-107, and the PR objectives, which say ADR-104. |
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Check name Status Explanation Docstring Coverage No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0… 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. Description check The description is related to the changeset. It describes the proposed ADR for a separate CRDs chart, the crds subchart, the Helm 4 adoption behavior, and the documentation-only change. It does name t… Full details: Docstring Coverage
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Explanation
No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (1 skipped: 1 unsupported.)
Full details: Description check
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Explanation
The description is related to the changeset. It describes the proposed ADR for a separate CRDs chart, the crds subchart, the Helm 4 adoption behavior, and the documentation-only change. It does name the ADR as ADR-107, which conflicts with the files (ADR-104), but the description is clearly on topic.
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Full details: Title check
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Explanation
The title is about adding ADR-107 for a separate cluster-readiness-engine-crds chart. The changeset adds ADR-104 (file docs/designs/104-crds-chart.md) and an index entry, so the ADR number does not match the files. The rest of the title, a separate CRDs chart, matches the main change. The title is therefore partially accurate and needs the ADR number corrected.
Resolution
Change the ADR number in the title from ADR-107 to ADR-104 to match docs/designs/104-crds-chart.md and the README index entry. Also check the PR description, which also says ADR-107, and the PR objectives, which say ADR-104.
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Inline comments:
Review comments at @docs/designs/104-crds-chart.md:
- Line 58: Update the ordering guidance in the “Order: CRDs first on upgrade,
controller first on rollback” section to limit CRD-first upgrades to
backward-compatible schema changes. Require a deprecation release or an explicit
compatibility check before removing fields that older controllers may still
write, including during rollback while newer CRDs remain installed.
- Line 141: Update the Argo CD sequence in the design documentation to make the
CRD tracking handoff explicit: state the required resource-tracking mode and
ensure the main Application relinquishes CRD tracking before
`crds.enabled=false` is applied, or document a `Prune=false` safeguard. Validate
and document that the sequence preserves CRDs with automated pruning enabled.
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CRD-first upgrades are safe only for additive schema changes: a field is removed from the CRDs only once the previous release's controller no longer writes it, since its writes would be pruned on upgrade and on rollback. The Argo CD migration now disables automated pruning on the main Application while crds.enabled is switched off, and checks that the CRDs Application tracks the CRDs first. While both Applications render the CRDs either may hold tracking, so ordering alone does not keep the main Application from pruning them. The sequence is listed as untested until the docs are validated against it. Refs #357 Signed-off-by: Kayne Tu <kaynet@nvidia.com>
…tial upgrades Argo CD: with self-heal, either Application can reclaim tracking of the CRDs while both render them, so the handoff is now explicit: the CRDs Application uses ServerSideApply=true, pruning on the main Application is off while crds.enabled is switched off, the CRDs Application syncs last, and pruning returns only once it alone tracks the CRDs. nvcrectl: when a Helm release owns the CRDs, setup init also passes --skip-crds to helm upgrade --install, so a first install of the main release does not re-apply the subchart's CRDs and strip the CRDs chart's ownership on Helm 4. Partial upgrades: Helm applies the CRDs one at a time, so a conflict leaves some upgraded. The docs now describe that state, why it is safe under the upgrade order, and the recovery: rerun with --force-conflicts, then upgrade the main chart. Refs #357 Signed-off-by: Kayne Tu <kaynet@nvidia.com>
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Inline comments:
Review comments at @docs/designs/104-crds-chart.md:
- Line 110: Update installHelmRelease’s CRD-skip condition to skip
reconciliation only when all seven CRDs have matching ownership metadata for an
existing Helm release. For stale, partial, or mismatched ownership, run
applyChartCRDs and ensure nvcreHelmUpgradeArgs omits --skip-crds; reuse the
ownership annotation parsing shared with jobset_ownership.go.
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… CRDs crds.keep leaves the Helm ownership annotations on the CRDs after helm uninstall, so "any CRD carries meta.helm.sh/release-name" could match a release that no longer exists, and nvcrectl would stop reconciling the CRDs for good. nvcrectl now skips its apply, and passes --skip-crds, only when all seven CRDs name the same release and helm status confirms it exists. In every other case it applies the CRDs as today, warning when ownership is split. Also fixes a stray comma in the nvcrectl implementation note. Refs #357 Signed-off-by: Kayne Tu <kaynet@nvidia.com>
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Inline comments:
Review comments at @docs/designs/104-crds-chart.md:
- Line 110: Update installHelmRelease so it skips applyChartCRDs and adds
--skip-crds through nvcreHelmUpgradeArgs only when helm status reports the CRDs
release as deployed. For failed, pending, or any other non-deployed status,
reconcile the CRDs or stop before upgrading the controller.
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…ease helm status returns a release whatever its state, so after a partial CRDs upgrade the release is failed yet still matched, and nvcrectl would upgrade the controller over partly upgraded CRDs. nvcrectl now skips its apply only when the owning release is deployed. A failed or pending-* release stops setup init before any change, with the release status and decision 6's recovery: applying the CRDs itself could downgrade CRDs the failed upgrade already moved. Refs #357 Signed-off-by: Kayne Tu <kaynet@nvidia.com>
…on check The Argo CD handoff is still unvalidated with automated pruning on. Before the deployment guidance ships, it is run end to end on a cluster with existing NVCRE objects, and passes only if all seven CRDs and every existing object survive the handoff and the re-enabling of pruning. Refs #357 Signed-off-by: Kayne Tu <kaynet@nvidia.com>
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🟠 Major · Do not apply chart CRDs when crds.enabled=false. · 104-crds-chart.md:53
docs/designs/104-crds-chart.md:53
🎯 Functional Correctness | 🟠 Major | ⚡ Quick winDo not apply chart CRDs when
crds.enabled=false.The proposed
nvcrectl setup initflow applies CRDs whenever they lack ownership metadata. It callshelm show crdsandapplyChartCRDsbefore Helm receives its values. Therefore, an unowned cluster can still receive all chart CRDs even when the main chart is installed withcrds.enabled=false, which contradicts the ADR's contract that this value disables CRDs in every tool.Pass the effective
crds.enabledvalue into the nvcrectl decision flow and skipfetchChartCRDsandapplyChartCRDswhen it isfalse.🤖 Prompt for AI Agents
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Outside diff comments:
Review comments at @docs/designs/104-crds-chart.md:
- Line 53: Update the proposed `nvcrectl setup init` flow to pass the effective
`crds.enabled` value into its CRD decision and skip both `fetchChartCRDs` and
`applyChartCRDs` when it is false, preserving the ADR contract across tools.
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Decision 3 says crds.enabled=false turns the CRDs off in every tool, but decision 7 had nvcrectl apply them whenever no Helm release owned them, even when the operator set crds.enabled=false through setup init. nvcrectl now skips fetching and applying the CRDs when the release's effective values, from this run or kept from an earlier one, set crds.enabled=false. The stop for a failed or pending-* owning release still applies. Refs #357 Signed-off-by: Kayne Tu <kaynet@nvidia.com>
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Inline comments:
Review comments at @docs/designs/104-crds-chart.md:
- Line 66: Update the `crds.enabled=false` description in the CRD design so it
does not imply that `helm show crds` suppresses CRDs; document the required
ownership handoff for that consumer, or specify how the affected consumer avoids
applying them during migration.
- Line 112: Update the implementation description for installHelmRelease to
match decision 7: keep the deployed behavior, state that failed or pending-*
status stops setup init, and clarify that an uninstalled or missing release
allows nvcrectl to apply the CRDs.
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…e states helm show crds ignores dependency conditions, so crds.enabled=false turns the CRDs off wherever Helm renders the chart (install, upgrade, template, Argo CD, Flux) but not for scripts built on helm show crds. Decision 3 now says so and requires such a script, like AICR's apply-crds.sh, to be retired in the same change that sets the value; nvcrectl already reads the value itself. The nvcrectl implementation note said every non-deployed status stops setup init, contradicting decision 7. Both now list the states: deployed skips the apply, failed or pending-* stops, and uninstalled (kept by helm uninstall --keep-history) or no release applies the CRDs as today. Refs #357 Signed-off-by: Kayne Tu <kaynet@nvidia.com>
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This reads well and the load-bearing mechanics hold. I built the proposed layout as a scratch chart on Helm 3.18.4: condition: crds.enabled does suppress the subchart's crds/ under helm template --include-crds (1 CRD at true, 0 at false), helm show crds ignores the condition and has no --set, which is exactly why decision 7 has nvcrectl read the value itself, and helm lint, helm dependency build --skip-refresh and helm package all succeed offline with no repository: on the dependency, with the tgz carrying charts/crds/crds/. The code citations check out at the head, 107 is free, and I see no collision with ADR-092 (no new +kubebuilder:rbac marker, CRD writes stay off the manager) or with #533's CEL work, since decision 4 keeps make manifests the single writer.
Three small things, none of them blocking.
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The Tests section asks
test/helmto render the CRDs chart and compare it to the subchart, but line 87 says the CRDs chart'sfiles/is staged at package time and not committed.test/helm/render_test.go:115-122builds a path in the source tree and:145-163shells out tohelm template <chartDir>, so renderinghelm/cluster-readiness-engine-crds/in-tree would emit zero CRDs and both thecrds.keepgoldens (line 174) and the identity assertion (line 176) would pass vacuously. The only staging step named ismake helm-package(line 70), whichMakefile:343runs afterhelm-lintand which no test depends on. Could you name the staging step the tests hang off, either amaketarget the test calls or committingfiles/and havingmake manifestswrite both copies? Separately,helmTemplateattest/helm/render_test.go:150passes no--include-crds, so the proposed main-chartcrds.enabledtrue/false goldens render nothing for either value unless that flag is added. -
The two citations of
docs/operations/deployment.md:165(lines 20 and 120) point one paragraph early. At the head, line 165 is "This is also the only path that works for an air-gapped workload image...", and the clause the ADR means, "...you take on installing the Kubeflow Trainer version this release supports and re-applying the CRDs on upgrades yourself", is line 167 under Bypasssetup init. Same at the merge base, so it is not head drift. Citing the bold lead-in would survive future line drift. -
The "about 500 KB of Helm's 1 MiB limit" figure at line 101 is the manifest copy only. The seven CRDs total 1,889,347 bytes at the head, and since
chart.File.Datais a[]byte, the chart's copy is base64 before gzip, which compresses worse than the manifest's raw YAML. Manifest plus a base64 copy comes to 686,141 bytes encoded, against 504,501 if both copies were raw YAML. Still under 1,048,576, but the margin is nearer 1.5x than 2x, which matters given line 17's point that every minor release adds CRD fields.
Summary
Adds ADR-107 (status: Proposed), the design for #357. Helm installs a chart's
crds/directory only on the first install, so a plainhelm upgraderuns the new controller against the old CRD schema. The API server then silently prunes the fields the old schema lacks, and the controller stays Ready. nvcrectl works around this (#145) and Argo CD is unaffected, but direct Helm, Helmfile and default Flux installs are not. Every minor release from v0.5.0 to v0.8.0 changed the CRDs.What the ADR proposes:
cluster-readiness-engine-crdswith every release. The CRDs are rendered fromtemplates/, sohelm upgradekeeps them current, including removing fields. Each CRD carrieshelm.sh/resource-policy: keep.crdssubchart (crds.enabled, defaulttrue), the kube-prometheus-stack layout. The default behaves exactly like today.crds.enabled=falseturns the CRDs off in every tool, which AICR's bundles and Argo CD need.--take-ownership. On Helm 4, clusters where nvcrectl, AICR's script or a manualkubectl apply --server-sidealso applied the CRDs need--force-conflictstoo.Left out of scope: removing the CRDs from the main chart, which would break main-chart-only installs; a controller-side schema check; Trainer and JobSet CRDs.
Review focus
crdssubchart. It's the one choice that changes the main chart's layout. It also moves the CRD path inside the published chart fromcrds/tocharts/crds/crds/.crds/over existing CRDs, stripping another release's ownership;spec.versions.Related Issue
Refs #357. The issue stays open until the implementation lands. AICR's side of the same problem is tracked in NVIDIA/aicr#2525.
Type of Change
Component(s) Affected
Testing
go test ./test/docspolicy/,make verify-doc-links)Checklist
git commit -s)make manifests generaterun (if*_types.gowas modified)