docs: fix inconsistent duration total in dashboard-metrics-relation.md

[yahonda]

What is changed, added or deleted? (Required)

Fixes an arithmetic inconsistency in an example in dashboard/dashboard-metrics-relation.md.

The text states: "The total duration of TiDB sending key-value requests is 14745.07 seconds, during which the key-value requests for the Get and Cop types respectively consume 9798.02 seconds and 4946.46 seconds."

9798.02 + 4946.46 = 14744.48, which differs from the stated total of 14745.07 by 0.59 seconds — too large a gap to be a rounding artifact, and the paragraph explicitly defines the total as the sum of these two components. Corrected the total to 14744.48 to match the sum of its own stated parts.

Found via a CodeRabbit review comment on pingcap/docs#23883 while reviewing the Japanese translation, which faithfully mirrors this EN inconsistency (and is intentionally not being changed ahead of this EN fix — the weekly sync will propagate it).

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

• v8.5 (TiDB 8.5 versions)

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

• This PR is translated from:
• Other reference link(s): pingcap/docs#23883

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

🤖 Generated with Claude Code

[coderabbitai]

Warning

Review limit reached

Next included review available in 9 seconds.

Check out review usage here.

View limit details

Limit details: You’ve used all 4 included reviews currently available.

You've used all free OSS reviews for now. Wait for the free limit to reset to keep reviewing this public repository.

Learn how review limits work.

Review configuration:

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

Review profile: ASSERTIVE

Plan: Advanced

Run ID: 2b4c6498-6a62-4ffb-8164-d5c77c9eef6b

📥 Commits

Reviewing files that changed from the base of the PR and between 6acba5d and 9fa6adc.

📒 Files selected for processing (1)

• dashboard/dashboard-metrics-relation.md

---

Thanks for using CodeRabbit! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.

❤️ Share

• X
• Mastodon
• Reddit
• LinkedIn

_{Comment @coderabbitai help to get the list of available commands.}

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by:
Once this PR has been reviewed and has the lgtm label, please assign qiancai for approval. For more information see the Code Review Process.
Please ensure that each of them provides their approval before proceeding.

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

Details

Needs approval from an approver in each of these files:

• OWNERS

Approvers can indicate their approval by writing /approve in a comment
Approvers can cancel approval by writing /approve cancel in a comment

[yahonda]

Closing — verified against the actual screenshot referenced right above this text (media/dashboard/dashboard-metrics-relation-relation-example2.png): the real dashboard shows tidb_kv_request: 0.00s (0.00%) of 14745.07s (68.28%), confirming 14745.07 is the correct, real measured value from the dashboard, not a documentation typo. The 0.59s gap vs. the sum of the two child values (9798.02 + 4946.46 = 14744.48) is a genuine artifact of the underlying metrics/measurement, not an authoring error. My original "fix" was wrong — thanks to the user for catching this before merge.