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 MachinePool Health page under a new “Pools and Lifecycle” architecture section.
  • Documented MachinePool health reporting, heartbeat behavior, Ready status transitions, and timing configuration.
  • Clarified that pool health does not currently affect scheduling; pools marked Ready=False or Ready=Unknown may still receive assignments.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 8fb88a88-bcd4-4ea4-be4d-7fb92806bea2

📥 Commits

Reviewing files that changed from the base of the PR and between 89de403 and 74a9996.

📒 Files selected for processing (1)

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

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

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

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📝 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, configuration, and scheduling documentation 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 implementation documented by this change.

Suggested labels: enhancement, size/L

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly identifies the primary change: documenting MachinePool health.
Description check	✅ Passed	The description explains the documentation changes and issue contribution, but it does not use the repository template headings.
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

[afritzler]

Do we need this info in the machine pool section?

[friegger]

No, I was thinking, someone might come up with that question, but I can also remove it.

[friegger]

Removed.