feat: Flatten Explore section into Product sidebar with section headers

[sfanahata]

Summary

Flattens the product/explore/ section, moving its 6 child directories up to product/ so features like Logs, Traces, and Session Replay are visible at L2 instead of buried at L3.

Adds sidebar section headers (Detect, Debug, Measure, Automate, Platform) to the Product sidebar using the existing sidebar_section mechanism.

Rewrites the Product index page and Getting Started section to reflect Sentry's current product positioning and feature set. Deletes the orphaned /product/onboarding/ section. Hides dated tutorials (distributed-tracing, integrate-frontend, integrate-backend) from sidebar while keeping URLs functional. Fixes broken links, dead references, and stale content across sentry-basics sub-pages.

Changes

Code changes (3 files):

• Extended sidebar_section in dynamicNav.tsx, frontmatter.ts, types.ts to support 5 new section values: detect, debug, measure, automate, platform

File moves (6 directories, ~89 files):

• product/explore/trace-explorer/ → product/trace-explorer/
• product/explore/logs/ → product/logs/
• product/explore/session-replay/ → product/session-replay/
• product/explore/profiling/ → product/profiling/
• product/explore/metrics/ → product/metrics/
• product/explore/discover-queries/ → product/discover-queries/

Content updates:

• Rewrote product/index.mdx — organized around Detect/Debug/Measure/Automate sections, added missing features (Logs, Seer, Snapshots, Size Analysis, AI Agents Monitoring), removed dated sections
• Rewrote product/sentry-basics/index.mdx — 4-step getting started hub (Connect Source Code → Set Up Alerts → Turn On Features → Explore Data), links to Guides, Cookbook, Sandbox
• Rewrote product/sentry-basics/performance-monitoring.mdx — removed duplicated paragraphs, stale Early Adopter reference, added Connected Context section (Logs, Replay, Profiling, Seer)
• Fixed broken links in tutorial sub-pages (dead /guides/integrate-* paths, dead /product/sentry-basics/enrich-data/ link)
• Fixed typo and code syntax error in user-feedback-basics.mdx
• Fixed broken blog.sentry.io URLs in session-replay performance-overhead pages

Deleted content:

• Removed product/onboarding/ (3 pages, orphaned — only 1 self-referencing inbound link, not linked from homepage or SDK pages)
• Hidden 3 dated tutorials from sidebar: distributed-tracing/, integrate-frontend/, integrate-backend/ (URLs still work for featureInfo.tsx references)

Frontmatter updates (~25 files):

• Every product/*/index.mdx gets sidebar_section and updated sidebar_order

Link updates (~200 files):

• All internal references to /product/explore/* updated to /product/*
• Removed 4 self-referencing redirect loops in middleware.ts
• Fixed broken blog.sentry.io URLs (date-prefixed → dateless format)

Redirects:

• Added redirects from old /product/explore/* paths to new locations
• Added redirects from /product/onboarding/* to /product/sentry-basics/
• Updated existing redirect destinations in redirects.js and middleware.ts

Section assignments

Section	Pages
Detect	Issues, User Feedback, Snapshots, Size Analysis
Debug	Traces and Spans, Logs, Session Replay, Profiling, Application Metrics, Log and Trace Drains, Discover
Measure	Dashboards, Releases, Stats
Automate	AI in Sentry, Monitors and Alerts
Platform	Build Distribution, Projects, Sentry Notifications, Sentry Toolbar, Relay, Partnership Platform

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Project	Deployment	Actions	Updated (UTC)
develop-docs	Ready	Preview, Comment	Jun 30, 2026 9:41pm
sentry-docs	Ready	Preview, Comment	Jun 30, 2026 9:41pm

[antonis]

The RN side LGTM 🙏

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