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## I have read the [CONTRIBUTING.md](https://github.com/supabase/supabase/blob/master/CONTRIBUTING.md) file. YES ## What kind of change does this PR introduce? Troubleshooting docs addition. ## What is the current behavior? This is troubleshooting documentation on how to diagnose missing real-time messages and isolate whether it is a client-side or server-side issue. ## What is the new behavior? Adds a step-by-step troubleshooting guide for Realtime. This helps check isolate connection and message delivery issues using:? Realtime Inspector: to confirm server-side dispatch. Browser DevTools: to confirm client-side receipt via WebSockets. <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit * **Documentation** * Added a Supabase Realtime troubleshooting guide for isolating server-side, client-side, and network-related subscription issues. * Covers Realtime Inspector checks for subscriptions, broadcasts, and presence; authorization and RLS validation; client configuration; WebSocket traffic in browser developer tools; network connection verification; and preparing diagnostic details for Support. <!-- end of auto-generated comment: release notes by coderabbit.ai --> --------- Co-authored-by: Ali Waseem <waseema393@gmail.com> Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: krishnasaivandavasi <241076000+krishnasaivandavasi@users.noreply.github.com>