i18n(ja): restore literal English metric names in TiDB Cloud monitoring docs

[yahonda]

What is changed, added or deleted? (Required)

Restores the literal English metric/panel names in TiDB Cloud built-in monitoring docs. The Metric name column in these dashboard tables must contain the literal panel name exactly as shown on the actual TiDB Cloud Metrics page in the product UI (for example, "Database Time by SQL types", "Query Per Second"). The Japanese translation had translated these literal names into Japanese descriptive phrases instead of keeping the literal English UI text. Also restored the accompanying Labels column values where the EN source itself presents them as literal legend/series values (e.g. {SQL type}, hit, miss, All, avg-in-txn) rather than descriptive prose.

• tidb-cloud/built-in-monitoring.md: 5 tables (Overview, Advanced, Server for Dedicated; Instance Overview, Database Status for Starter/Essential) — 58 Metric-name/Labels cells restored to literal English.
• tidb-cloud/premium/built-in-monitoring-premium.md: 3 tables (Overview, Database, Advanced) — 24 Metric-name/Labels cells restored to literal English.

Description columns (free translated prose) were left unchanged.

Which TiDB version(s) do your changes apply to? (Required)

• i18n-ja-release-8.5 (TiDB Japanese documentation for TiDB 8.5 versions)

What is the related PR or file link(s)?

• Related to the literal-value fixes in PR i18n(ja): fix state/executions/plans mistranslated as unrelated homonyms #23749 (same defect class: literal SQL/code/UI identifiers mistranslated into descriptive Japanese phrases).

AI agent involvement

• The changes in this PR were primarily made by an AI agent on behalf of the PR author.

Do your changes match any of the following descriptions?

• Delete files
• Change aliases
• Need modification after applied to another branch
• Might cause conflicts after applied to another branch

Summary by CodeRabbit

• Documentation
  • Updated TiDB Cloud built-in monitoring metric names and labels to match the English terminology displayed in the Metrics UI.
  • Applied consistent English naming across Dedicated, Starter, Essential, and Premium monitoring documentation.
  • Retained Japanese metric descriptions while standardizing metric names and label values.

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

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Run ID: e19c4d20-4595-4263-8c65-692b6d270830

📥 Commits

Reviewing files that changed from the base of the PR and between 80dffad and fec3448.

📒 Files selected for processing (2)

• tidb-cloud/built-in-monitoring.md
• tidb-cloud/premium/built-in-monitoring-premium.md

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📝 Walkthrough

Walkthrough

The monitoring documentation replaces Japanese metric names and labels with English names from the Metrics UI. Japanese metric descriptions remain in the Dedicated, Starter, Essential, and Premium tables.

Changes

Monitoring metric documentation

Layer / File(s)	Summary
Dedicated cluster metric names tidb-cloud/built-in-monitoring.md	The Dedicated Overview, Advanced, and Server tables now use English metric names and labels.
Starter and Essential metric names tidb-cloud/built-in-monitoring.md	The Instance Overview and Database Status tables now use English metric names and labels.
Premium metric names tidb-cloud/premium/built-in-monitoring-premium.md	The Premium Overview, Database, and Advanced tables now use English metric names and labels. Japanese descriptions remain unchanged.

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

Merge Risk: ⚪ Minimal · up to fec34

Monitoring documentation now matches the English metric and label names shown in the UI while preserving Japanese explanatory text. The documentation-only update is ready to merge.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly and concisely describes the main change: restoring literal English metric names in TiDB Cloud monitoring documentation.
Description check	✅ Passed	The description explains the changes, affected files and tables, version scope, related PR, AI involvement, and applicable change categories. It is sufficiently complete for review.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
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 💡 1

🛠️ Fix failing CI checks 💡

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2026-09-07 06:33:29.032977264 +0000 UTC m=+1693044.204071372: ☑️ agreed by qiancai.