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docs(designs): add ADR-060 behaviour profiles - #1952
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Propose behaviour profiles: named sets of quarantine, drain and remediation settings that operators assign to groups of nodes and devices through an ordered list of matchers (Kubernetes label selectors and CEL over the health event, first match wins, built-in "default"). platform-connectors resolves the profile once per event and records a reference (name, hash, matcher) on the health event; fault-quarantine, node-drainer and fault-remediation act on that reference instead of reading node labels for policy. Profiles hold switches and names that refer to configuration kept in each component, and are delivered as a CRD-shaped document in Helm values rendered into each consumer's ConfigMap.
Matchers select profiles with a single CEL expression that sees the health event and the node's labels, instead of a Kubernetes label selector plus an optional CEL expression. Node, device and fault conditions combine in one expression. An expression that fails to evaluate does not match and is counted per matcher. The resolver derives the label keys its expressions read so platform-connectors' node cache retains them, keeping every label when a key cannot be derived.
The ordered list that selects a profile for each event is now called routes, and the reference on the health event records the route that selected the profile.
Each profile section (quarantine, drain, remediation) has a single enabled field in this ADR. Each stage requires the one before it, so a profile is one of four shapes. How an enabled stage acts stays in each component's configuration. Drain methods, external hand-off, per-profile action maps, rule-set allow-lists and attempt limits move to a future extensions section, as fields that can be added next to enabled without invalidating existing profiles. The proposed health event status fields for the chosen drain method and remediation resource are dropped.
Rewrite the prose of the behaviour profiles ADR to follow ASD-STE100: short sentences with one topic each, active voice, simple tenses, no conditional verbs, and no idioms or -ing nouns. Long sentences become lists. The decision, the configuration examples, and the proto definitions do not change.
Add a section to ADR-060 that compares four options for faults in progress: pin the profile at ingest, select it again at each stage, select it again at each retry, and pin it but let a stage apply a more restrictive profile. The section explains that the pin applies to the profile name and not to its settings, lists the advantages and disadvantages of each option, and keeps option A as the proposal with option D as the recommended alternative. The related alternative and open question now refer to this section.
The section on profile changes for a fault in progress now compares two options: pin the profile when platform-connectors receives the event, or allow profile changes for a fault in progress. The second option is described in general terms, and the mechanism to apply changes is left to the design if the team selects it.
Add a table of contents after the status line. Remove the priority numbers and layered profiles entries from the alternatives considered.
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🌿 Fern Docs Preview: https://nvidia-preview-pull-request-1952.docs.buildwithfern.com/nvsentinel |
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Included review availability: This review used your included allowance. Your plan provides up to 12 included reviews per hour; 11 remain after this review. 📝 WalkthroughWalkthroughAdds proposed ADR-060 for behaviour profiles and links it from the ADR index. The ADR describes profile configuration, CEL route selection, stage decisions, rollout, and profile changes during fault processing. ChangesBehaviour Profiles
Priority: ⬇️ Low Estimated code review effort: 1 (Trivial) | ~5 minutes Change: Other Suggested reviewers: Merge Risk: ⚪ Minimal · up to The ADR consistently specifies re-evaluating profiles at each stage, so the prior pinning-policy conflict does not block merging. No other actionable risk is established in the reviewed changes. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches🧪 Generate unit tests (beta)
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Review comments at @docs/designs/060-behaviour-profiles.md:
- Around line 213-214: Update the behavior-profile resolver policy described in
the design so copies of an in-progress event retain the profile reference
already pinned to that fault, even after labels or routes change; only select a
profile for a new fault. If existing references may be reselected, explicitly
define the conditions that permit it.
- Around line 196-199: Update the behavior-profile mismatch rule so a stage does
not act when its local settings differ from the event’s selected profile; define
that it must reject or defer the event rather than use its own stale definition.
Apply the same rule to the related text at the referenced second section.
- Around line 393-394: Update the ADR reference in the drain-scope text so its
label and link use the number allocated to the pod-drain-policies record in
docs/designs/README.md; keep ADR-055 assigned to nvcre-certification-monitor and
do not reuse it.
- Around line 216-218: Update the fault-quarantine flow to handle
`quarantineOverrides.force` before the disabled-profile check, consistent with
event overrides taking priority. Specify that a forced event quarantines the
node and records the status indicating quarantine occurred, rather than
`SkippedByProfile`.
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docs/designs/060-behaviour-profiles.mddocs/designs/README.md
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I have a few questions about the design
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State that an event with quarantineOverrides.force is quarantined and recorded as Quarantined, without the profile check, so event overrides have priority over the profile. Refer to the pod label drain policies record by title, because two records in docs/designs use number 055.
Each component that acts on a fault (fault-quarantine, node-drainer, fault-remediation) now evaluates the routes itself, immediately before it acts, with the stored health event and the current node labels from the node data it already reads. Label and route changes therefore apply to faults in progress at the next action. Each stage records the profile and route it used in a new map on the health event status. platform-connectors no longer selects profiles, and the health event no longer carries a profile reference or hash. The pin-at-ingest design is kept as a rejected option, and the unresolved profile is removed because each component retries a failed node read as it does today.
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Different profiles for different stages of one fault are the intended result of selecting the profile from the current state, so they are no longer listed as a disadvantage of that option or as a negative consequence.
| - The record must show each profile that applied to the fault, and the stage that used it. | ||
| - The behaviour is more difficult to predict and to audit. | ||
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| If the team selects option B, the design must also define when a stage selects the profile again. It must also define |
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Right now the node-drainer section says it reads the profile "at the first attempt for an event", so a drain that's already started would just finish. But node-drainer drains in passes and already re-reads the node labels on every pass (that's how customDrain.nodeSelector works today). So under Option B, I could see it going either way: check once at the start, or check on every pass, which means a drain could stop halfway and leave the node cordoned and partly drained.
Both seem reasonable to me. I'd just like the ADR to say which one we're going with for each stage, I think its better to know whether flipping a label stops something that's already running.
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ah - thats a good point on node-drainer behavior. will take that into consideration here
Add a section that explains how behaviour profiles relate to the existing configuration of fault-quarantine, node-drainer, and fault-remediation, and how rule sets already apply different quarantine actions to different nodes. Add a section that outlines the fields that later work can add to each profile section, with the component configuration that each field refers to by name, the validation rules that they need, and the recommended first fields. This section replaces the future extensions list.
| slurm-vm: | ||
| quarantine: | ||
| enabled: true | ||
| ruleSets: ["GPU fatal error ruleset"] # names of fault-quarantine rule sets |
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I like enabling based on rule sets names as identifier. so then do you see one possible path as the behaviour profiles only handle enablement/disablement and the actual configuration will go into the modules?
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| **Routes are CEL expressions.** fault-quarantine rules ([ADR-003](003-rule-based-node-quarantine.md)) and health | ||
| event overrides ([ADR-021](021-health-event-property-overrides.md)) also use CEL. Each `expression` must return a | ||
| boolean. It can use two variables: |
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Can we be precise about the variables that are planned in the route CEL? Does it make to add resource slice that is associated with node as well?
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| Thus, one type of route can select node groups, devices, and fault types. A route can combine these conditions with | ||
| `&&`, for example `node.labels["example.com/platform"] == "vm" && event.componentClass == "GPU"`. A route can also | ||
| select a GPU product, or an accelerator that is not a GPU, with an expression on the impacted entities. This does not |
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an accelerator that is not a GPU
With the current variables of node and event, this is not possible to do in DRA world.
| - Each route refers to a defined profile, or to `default`. | ||
| - Each stage needs the stage before it. `drain` needs `quarantine`, and `remediation` needs `drain`. If NVSentinel | ||
| drains a node without a cordon, the pods start on the node again. If NVSentinel remediates a node that has | ||
| workloads, the workloads stop without a warning. Thus, a profile has one of four structures: |
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We already have generality of skipping drains by drainOverrides.skip. Why not build this to be around that?
| `remediation-failed`. Remediation needs drain, so an event with a skipped drain does not get to fault-remediation. | ||
| Thus, the trigger filter of fault-remediation does not change. | ||
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| A profile change does not undo an action that a stage already did. NVSentinel does not return pods that it evicted. |
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Can you please check if this is true? As noted above:
If the profile disables drain, node-drainer stops. It removes a custom drain CR, as it does for a cancelled
This is undo operation over the drain, right?
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@jtschelling this PR now has merge conflicts with |
| configuration operates as it does in the current release. An operator can add profiles without a change to the | ||
| existing configuration. | ||
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| The rule sets can already apply different quarantine actions to different nodes. Each rule set has its own taint, |
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In a future phase, it looks like we're adding support to behavior profiles to set custom fault-quarantine rule sets. Can you clarify why that's required? Since we can already configure per-node behavior in the rule set, that shouldn't be needed right? Unless we're trying to add a centralized location for any node-specific overrides across all modules.
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| | `quarantine` | NVSentinel does not cordon, taint, or label the node for this fault. No later stage runs | `nodeQuarantined: SkippedByProfile` | | ||
| | `drain` | The node stays in quarantine. NVSentinel does not evict more pods | `userPodsEvictionStatus: Skipped` and the node state `drain-skipped` | | ||
| | `remediation` | The node stays in quarantine and drained. NVSentinel does not create a maintenance CR | The node state `remediation-skipped` | |
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Can we be consistent and also update the HealthEvent status for remediation here?
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i'm going to come back to this one later. this would require an additional schema change for the health event. i'm not inherently opposed to doing that but want to get the rest of this in a reviewable state
| operator must cancel the fault to change its behaviour. The design also needs rules for the hash during a rollout, and | ||
| for copies of events that other components publish again. | ||
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| ## Additional configuration for behaviour profiles |
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Long-term, how do we decide which fields are included in the Helm chart with a single default vs. included in a behavior profile? Will this be a judgement call to opt-in any new feature which may need different settings according to the node or health event? In the example, I'm not sure if we should support some settings like maxAttempts or logCollector in profiles which should not vary between node or GPU types.
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i made an attempt at defining a ruleset for including fields in the behaviourProfile schema, pushed it to the ADR. i'm reworking quite a bit on the ADR so it might move around in the document, but i think being explicit about your concern here is worthwhile. definitely want to avoid judgement calls. maxAttempts/logCollector details were poor examples and played to the confusion here so they got the boot
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| - Circuit breaker limits for each profile. The circuit breaker continues to apply to the full cluster. | ||
| - Dry run for each profile. The global `dryRun` setting applies to all profiles. | ||
| - Validation after remediation for each profile. |
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A validation rule-set override in profiles would allow for requesting different post-remediation tests per node type (if we didn't want the default rule-set to derive this on its own by looking at node labels). Long-term, a profile for validation itself may be useful since currently there is no way to configure different test behavior for the same test against different node types without creating a different test name and using different test settings or by deriving any test differences in the test provider (which is what NVCRE does to configure the test behavior depending on CSP + GPU type).
I don't think we need this initially but wanted to call out that we may need profile support for modules like the lifecycle-manager which don't operate on the HealthEvent API.
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im going to leave this one open for now and we can discuss it later. not sure if we'll want to include it in the scope of this ADR or not
…profiles # Conflicts: # docs/designs/README.md
The context no longer says that NVSentinel applies the same behaviour to all nodes. fault-quarantine rule sets and node-drainer custom drain can already vary by node. The gap is that each component uses a different mechanism, and fault-remediation has no per-node control.
Every profile keeps fault detection, health event storage, and node conditions; profiles only switch quarantine, drain, and remediation. Reword the covered cases so a quarantine-only group does not read as a group without monitoring.
Add the conditions for a profile field: the setting varies by node group, device type, or fault type; it controls what NVSentinel does to the node rather than how the component runs; and the component can apply it per event. Remove maxAttempts and logCollector from the candidate fields, because they do not meet these conditions, and state why partialDrain does.
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Summary
Adds ADR-060 (proposed): behaviour profiles. A profile enables or disables quarantine, drain, and remediation. An ordered list of CEL routes selects the profile for each health event, and platform-connectors records it on the event. Profiles are configured through Helm values. Per-profile drain methods and remediation actions are future extensions.
Open question for reviewers: should a fault in progress keep its profile, or follow label changes? See "Profile changes for a fault in progress".
Relates to #1903 and #1904.
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