dashboard: add note about disk warnings

[dveeden]

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[gemini-code-assist]

Summary of Changes

Hello @dveeden, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request enhances the TiDB Dashboard documentation by providing important context regarding disk information display. It clarifies expected behavior when disk details are unavailable for specific hosts, ensuring users understand that a warning sign in such cases is normal and not indicative of an error.

Highlights

• Documentation Update: Added a note to the dashboard-cluster-info.md file explaining why disk-related information might not be displayed for certain hosts and clarifying that a "Failed to get host information" warning is expected behavior in these scenarios.

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[dveeden]

cc @kissmydb

[gemini-code-assist]

Code Review

This pull request adds a note to the TiDB Dashboard documentation explaining why disk information might not be available for some hosts. My review focuses on improving the clarity, conciseness, and style of the new note to align with the documentation style guide. I've suggested a revised version of the note for better readability.

[dveeden]

Some examples:

TiUP Playground:

TiDB Operator/k8s:

Looks like this uses http://127.0.0.1:2379/dashboard/api/host/all which responds like this:

So it has instances with type and partition and then a list of partitions with path, fstype, etc

[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2025-10-15 07:26:31.103942239 +0000 UTC m=+251897.181194798: ☑️ agreed by Oreoxmt.
• 2025-10-15 07:34:02.682278434 +0000 UTC m=+252348.759530994: ☑️ agreed by hfxsd.

[hfxsd]

/approve

[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hfxsd

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[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.1: #21914.

[ti-chi-bot]

In response to a cherrypick label: new pull request created to branch release-8.5: #21915.