docs(design-proposals): component health reporting proposal - #64
docs(design-proposals): component health reporting proposal#64IvanHunters wants to merge 5 commits into
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Propose a health-reporting controller that materializes core-component, node, and backup health into a namespace-scoped Health CRD (health.cozystack.io), giving a single kubectl-native, per-node and per-tenant view consumed by the dashboard, kubectl, and alerts. Signed-off-by: IvanHunters <xorokhotnikov@gmail.com>
Signed-off-by: IvanHunters <xorokhotnikov@gmail.com>
Reference existing cozystack health/readiness mechanisms the proposal builds on: WorkloadMonitor/WorkloadsReady, the kstatus readiness epic, backup-state visibility, the diagnostics-surface proposal, existing one-shot health collectors, and the status-lies incidents that motivate the fact-reporting non-goals. Signed-off-by: IvanHunters <xorokhotnikov@gmail.com>
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📝 WalkthroughWalkthroughThe proposal defines a namespace-scoped ChangesComponent health reporting
Estimated code review effort: 1 (Trivial) | ~5 minutes Merge Risk: 🟡 Moderate · up to The proposal leaves important security, freshness, aggregation, and rollback behavior undefined, which could lead to unauthorized health visibility, stale or inconsistent status, misleading diagnostics, or broken consumers. It is not merge-ready until these contracts and ownership rules are clarified. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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Actionable comments posted: 8
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Inline comments:
In `@design-proposals/component-health-reporting/README.md`:
- Around line 89-91: Clarify ownership and write permissions for the Health
resource: make spec.sla immutable or explicitly controller/policy-owned, define
its precedence relative to backup policy, enable the status subresource, and
restrict status writes to the controller while preventing tenant status updates.
- Line 127: Update the HelmRelease graph reporting guidance so selecting the
first not-ready dependsOn node is treated as a heuristic hint rather than a
reported fact. Move root selection to the later hint phase, or define
deterministic handling for multiple roots and explicitly label the inference as
heuristic.
- Around line 92-98: Define the overall status rollup contract for the status
schema, including deterministic precedence for mixed node states, behavior for
empty node results, stale-source handling, and aggregation across multiple
backup targets before publishing v1alpha1. Document the resulting rules near the
overall and observedAt fields, using the existing status values Healthy,
Degraded, Down, and Unknown.
- Around line 181-183: Update the rollback section to acknowledge that the
dashboard, KSM alerts, and plugin depend on the Health CRD and objects. Specify
the rollback order: first disable the consumers or make them tolerate missing
data, then remove the controller and CRD.
- Line 111: The README must not claim namespace-scoped RBAC comes automatically
from a namespaced CRD. Update the namespace-scoping description to state that
access requires explicit namespace-only Roles and RoleBindings, and include
validation that tenant credentials cannot list health resources cluster-wide.
- Around line 99-109: Update the component health condition schema and example
to expose affected resources through a structured resourceRef field and
represent backup freshness with typed fields such as lastSuccessfulAt, maxAge,
and observedAge; do not rely on message or lastTransitionTime for these values.
- Around line 191-194: Extend the health freshness contract in the “Failure and
edge cases” guidance to cover stopped controllers and failed Health writes:
define a freshness deadline or heartbeat, and require consumers reading overall
health to map expired observations to Unknown rather than retaining stale
Healthy status.
- Around line 119-128: Specify bounded execution for the per-component adapters:
define timeout and cancellation behavior, retry limits with backoff, and
concurrency limits. Add tests showing that a stalled adapter is marked Unknown
while other adapters continue and complete independently.
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design-proposals/component-health-reporting/README.md
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Resolve internal contradictions and underspecified contracts surfaced in review: - spec is controller/policy-owned and not tenant-writable; status subresource restricts status writes to the controller - define a deterministic overall rollup (worst-wins precedence, stale and empty-source handling, multi-target aggregation) - add structured resourceRef and typed backup-freshness fields instead of overloading message / lastTransitionTime - stop claiming namespace RBAC is automatic; require explicit namespace-only Roles/RoleBindings and a cross-tenant isolation test - report HelmRelease facts only; defer single-root selection to the Phase 4 heuristic layer to honor the no-root-cause non-goal - fix rollback dependency order (disable consumers before removing CRD) - add freshUntil deadline and watchdog so a stopped controller cannot leave stale Healthy status - specify bounded adapter execution (timeout, retry, concurrency) with matching resilience and RBAC tests Signed-off-by: IvanHunters <xorokhotnikov@gmail.com>
Add three mermaid diagrams: the motivating dashboard-503 failure cascade in The problem, the overall status state machine (including freshUntil expiry to Unknown) in the data model, and the reconcile sequence showing the decoupled controller write path and consumer read path. Signed-off-by: IvanHunters <xorokhotnikov@gmail.com>
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IvanHunters check this out cozystack/cozystack#2755, I'm using it as cli tool for quick overview of cozystack installation, initially was a shell script cozystack/cozystack#2294, later upgraded to go cli and added more resources to track. Still not have proper build, docs and adoption to upgrade/debug process. For platform wide health checking I would like to see some monitoring infrastructure: exporters, dashboards and alerting rules right out of the box. check-readiness must be a module of cluster administrator cli as mentioned here #51, I can show a PoC of this tool if you want |
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Thanks Daniil, this helps. check-readiness (#2755, and the #2294 shell script before it) is exactly the prior art this proposal builds on. It's already cited in the Prior art section, as a point-in-time collector whose logic the health-controller would materialize continuously. I think we're agreeing. Let me put the layering in writing so it isn't implicit. kubectl has to work without any CLI at all, and with the CRD it does. Where check-readiness fits: it should read the Health API rather than re-derive health. Right now it re-derives readiness client-side, parsing conditions across every resource kind on each run. Move that server-side into the CRD once and the CLI collapses to a thin reader, one get/watch on The monitoring infra you are describing is the consumer side of this, not a competing design. Exporters are kube-state-metrics over Two things I do not want to lose, because check-readiness is genuinely good at them:
And yes to the PoC. It would directly inform the initial adapter set and where the check-readiness-as-CLI-module boundary sits. Want to walk through it and fold the outcome into the Prior art / Open questions of this proposal? |
2 participants
Adds a design proposal: Unified health reporting for core components, nodes, and backups via a native CRD (
design-proposals/component-health-reporting/).It proposes a read-only
health-controllerthat collects health from each core component's native source (metrics, component CRDs/APIs, HelmRelease graph, CNPG/etcd backups) and materializes it into a namespace-scopedHealthCRD (health.cozystack.io): a singlekubectl-native, per-node and per-tenant view, consumed the same way by the dashboard,kubectl, andkube-state-metrics-based alerts. Scope is deliberately narrow: report facts, not automated cross-layer root-cause, and not time-series (that stays in Grafana).A Prior art section relates the proposal to existing cozystack health/readiness work (WorkloadMonitor /
WorkloadsReady, the kstatus readiness epic, backup-state visibility, the diagnostics-surface proposal, existing one-shot health collectors, and the "status lies" incidents that motivate the fact-reporting non-goals).Related:
proposal/coroot-ebpf-observability(observability): this proposal surfaces current actionable health state as a CRD, not tracing/metrics collection.Before review
decisions/directory, or says below why none is needed.This is a new proposal, not a revision of a merged one, so no decision record is needed.
DCO
git commit --signoff).Summary by CodeRabbit