Document MachinePool Health

[friegger]

MachinePool health monitoring documented based on the implementation of IEP-15.

This adds a new Pools and Lifecycle section, which can also accommodate MachinePool eviction and other lifecycle related topics in the future.

Contributes to #ironcore-dev/ironcore#1472

Summary by CodeRabbit

• Documentation
  • Added a new “Pools and Lifecycle” subsection in the Architecture sidebar, including a MachinePool Health page.
  • Documented how MachinePool health is determined and updated via heartbeat/lease renewal and Ready status transitions, including timing/configuration defaults.
  • Added a Scheduling warning clarifying that the scheduler does not consider pool Ready health; pools with Ready=False or Ready=Unknown can still receive assignments.

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: a280a5af-8c09-48a4-88ee-3dac2fe5c2e3

📥 Commits

Reviewing files that changed from the base of the PR and between 89de403 and 0d76afc.

📒 Files selected for processing (1)

• docs/iaas/architecture/machine-pool-health.md

📝 Walkthrough

Walkthrough

Adds architecture documentation for MachinePool health reporting, including Lease heartbeats, Ready condition semantics, lifecycle grace-period handling, configuration defaults, and current scheduler behavior. Adds the page to the IaaS architecture sidebar and scheduling documentation.

Changes

MachinePool health documentation

Layer / File(s)	Summary
Health signals and readiness semantics docs/iaas/architecture/machine-pool-health.md	Documents Lease heartbeats, IRI probe outcomes, and Ready condition updates from machinepoollet.
Lifecycle detection and scheduling behavior docs/iaas/architecture/machine-pool-health.md, docs/iaas/architecture/scheduling.md, docs/.vitepress/config.mts	Documents grace-period handling, timing configuration, scheduler behavior, and sidebar navigation for the new page.

Estimated code review effort: 2 (Simple) | ~10 minutes

Possibly related issues

• ironcore-dev/ironcore#1472 — Covers the MachinePool health heartbeat and status-condition implementation described by this documentation.

Possibly related PRs

• ironcore-dev/ironcore-dev.github.io#115 — Also updates docs/iaas/architecture/scheduling.md, although it focuses on style and wording.

Suggested labels: enhancement, size/L

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Description check	⚠️ Warning	The description mentions the new docs and future scope, but it does not follow the required template headings or include a proper Fixes # section.	Rewrite it using the template: add # Proposed Changes bullets and a Fixes # line, and keep the future-scope note if needed.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly matches the main change: adding documentation for MachinePool health.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch enh/ironcore-1472-add-machine-pool-health-docs

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@docs/iaas/architecture/machine-pool-health.md`:
- Around line 11-15: Clarify in the architecture page that the MachinePool
reconciler is the sole writer of MachinePool.status, including the Ready
condition. Revise the lifecycle controller description to say it triggers status
reprocessing when the machinepoollet stops reporting, rather than marking Ready
directly; do not describe both components as status writers.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 0d01afa8-2f4f-48f0-9d29-24b59daded9e

📥 Commits

Reviewing files that changed from the base of the PR and between 4467d8e and b8432ce.

📒 Files selected for processing (3)

• docs/.vitepress/config.mts
• docs/iaas/architecture/machine-pool-health.md
• docs/iaas/architecture/scheduling.md