chore(docs): Add Envoy Proxy monitoring dashboard page

[crazyuploader]

Closes: #2585

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Project	Deployment	Review	Updated (UTC)
signoz-web	Ready	Preview, Comment	Jan 26, 2026 6:16pm

[claude]

Claude finished @crazyuploader's task in 1m 46s —— View job

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Review Complete

I've reviewed the Envoy Proxy monitoring dashboard documentation. The PR adds comprehensive documentation for the Envoy dashboard template, including proper setup instructions, dashboard previews, and metric descriptions.

Summary

Strengths:

• ✅ Frontmatter is complete with proper date, id, title, description, and doc_type: explanation
• ✅ Technical accuracy verified - OpenTelemetry Stat Sink reference is correct per official Envoy documentation
• ✅ Dashboard preview images are in WebP format and properly organized
• ✅ Includes prerequisite link to the Envoy metrics guide
• ✅ Dashboard variables and metrics are well-documented
• ✅ Related dashboards section provides useful cross-links
• ✅ Component file correctly added with appropriate icon and metadata

Recommendations:

1. Image captions: The three dashboard preview images all use the same caption ("Envoy Dashboard Preview"). Each should have a unique, descriptive caption indicating what section of the dashboard is shown.
2. Missing section: Consider adding a "What This Dashboard Monitors" section after Dashboard Variables to describe the key insights users gain from this dashboard (per CONTRIBUTING.md guidelines for dashboard templates).

Labeling Decision:
No add-to-onboarding label needed. This PR adds a dashboard template page, not a new data ingestion method.

Technical Verification

I verified the technical accuracy of the Envoy OpenTelemetry integration:

• ✅ OpenTelemetry Stat Sink configuration reference is accurate
• ✅ Links to official Envoy documentation are correct

Sources:

• https://www.envoyproxy.io/docs/envoy/latest/configuration/observability/stat_sinks/open_telemetry_stat_sink
• https://www.envoyproxy.io/docs/envoy/latest/api-v3/extensions/stat_sinks/open_telemetry/v3/open_telemetry.proto

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