chore(metrics): remove leftover client_golang tutorial scaffolding

[veyron-kairo]

What type of PR is this?
/kind cleanup

What this PR does / why we need it:
Removes dead scaffolding left over from the client_golang tutorial in cmd/vGPUmonitor/metrics.go: the unused ReallyExpensiveAssessmentOfTheSystemState mock function (returned fabricated data, no callers), a block of commented-out functions (parseidstr, gettotalusage, getTotalUtilization), and two stale doc comments referencing them. No functional change — the Zone field and all metric output are untouched.

Which issue(s) this PR fixes:
Addresses the dead-code item of #2249 (per-scrape descriptor hoisting will follow as a separate PR).

Special notes for your reviewer:
No behavior change. make verify and go build ./cmd/vGPUmonitor/ pass locally.

AI assistance disclosure:
I used AI assistance (Claude Code) to identify the dead code . I reviewed and verified the change (confirmed zero callers), wrote the commit message myself, ran make verify locally, and take responsibility for it.

Does this PR introduce a user-facing change?:
NONE

Summary by CodeRabbit

• Documentation
  • Updated monitoring documentation to accurately describe GPU, pod, and container metric collection.
  • Clarified concurrency requirements and the current monitoring behavior.
  • Removed outdated examples and obsolete guidance to make the documentation easier to follow.
  • Improved descriptions of cluster monitoring and metric collection for clearer reference.

[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: 5330fb33-73c4-489f-bc73-1f89f39e2252

📥 Commits

Reviewing files that changed from the base of the PR and between 17d59d8 and 929b74b.

📒 Files selected for processing (2)

• cmd/vGPUmonitor/main.go
• cmd/vGPUmonitor/metrics.go

💤 Files with no reviewable changes (1)

• cmd/vGPUmonitor/main.go

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

• cmd/vGPUmonitor/metrics.go

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📝 Walkthrough

Walkthrough

The change removes obsolete example code and comments from the vGPU monitor. It updates documentation for monitor state, metric collection, shared-informer lookups, and zone-labeling registration. It also removes the mock assessment method.

Changes

vGPU monitor documentation cleanup

Layer / File(s)	Summary
Monitor state and collection contract cmd/vGPUmonitor/metrics.go	ClusterManager now documents active monitor state. Collect documents GPU, pod, and container metrics and concurrent-call safety. The obsolete assessment method and helper comments are removed.
Cluster registration documentation and wiring cleanup cmd/vGPUmonitor/metrics.go, cmd/vGPUmonitor/main.go	NewClusterManager documents shared-informer pod lookups and zone-labeling registration. Stale commented registration examples are removed.

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

Possibly related issues

• Project-HAMi/HAMi#2249 — Covers the vGPU monitor scaffolding cleanup and removal of obsolete assessment code.

Possibly related PRs

• Project-HAMi/HAMi#2275 — Makes the same vGPU monitor cleanup changes, including documentation updates and removal of ReallyExpensiveAssessmentOfTheSystemState.

Suggested reviewers: dsfans2014

Poem

A rabbit tidies monitor lore,
Mock methods hop out the door.
GPUs, pods, and containers align,
Shared lookups read clear and fine.
Clean comments now mark the way.

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 50.00% which is insufficient. The required threshold is 80.00%.	Write docstrings for the functions missing them to satisfy the coverage threshold.

✅ Passed checks (4 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely describes the removal of obsolete client_golang tutorial scaffolding.
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

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[mesutoezdil]

lgtm. nit: two more tutorial scraps remain, the commented NewClusterManager("ca") in main.go and the "Prometheus-ignorant" comment above NewClusterManager, mind sweeping those too?

[veyron-kairo]

@mesutoezdil done, swept both.

[mesutoezdil]

/lgtm

[archlitchi]

/lgtm

[hami-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: archlitchi, veyron-kairo

The full list of commands accepted by this bot can be found here.

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Details

Needs approval from an approver in each of these files:

• OWNERS [archlitchi]

Approvers can indicate their approval by writing /approve in a comment
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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

Flag	Coverage Δ
unittests	64.26% <ø> (+0.04%)	⬆️

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see 1 file with indirect coverage changes

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