docs(self-hosted): visualize kafka lags through UI

[aldy505]

DESCRIBE YOUR PR

Not all self-hosted users has experience with managing Kafka, since most of them are developers, not SRE. Through this, hopefully they can visualize (and monitor) their Kafka lags better.

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• Urgent deadline (GA date, etc.):
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SLA

• Teamwork makes the dream work, so please add a reviewer to your PRs.
• Please give the docs team up to 1 week to review your PR unless you've added an urgent due date to it.
  Thanks in advance for your help!

PRE-MERGE CHECKLIST

Make sure you've checked the following before merging your changes:

• Checked Vercel preview for correctness, including links
• PR was reviewed and approved by any necessary SMEs (subject matter experts)
• PR was reviewed and approved by a member of the Sentry docs team

EXTRA RESOURCES

• Sentry Docs contributor guide

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Name	Status	Preview	Comments	Updated (UTC)
develop-docs	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Jul 28, 2025 8:05am

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Name	Status	Preview	Comments	Updated (UTC)
sentry-docs	⬜️ Ignored (Inspect)	Visit Preview		Jul 28, 2025 8:05am