For AI agents: the complete documentation index is at llms.txt. Remove the trailing slash from a page URL and append .md to read its Markdown version. For the docs home, use index.md.
Add the reflex-otel package: an OpenTelemetry instrumentor that turns on the framework's built-in trace points and metrics (one span per event handler run, chained events parented under the enqueuing span, frontend traceparent propagation, event/state/websocket metrics, compile spans) and wraps the ASGI app in the OpenTelemetry ASGI middleware. OtelPlugin(endpoint=...) adds browser tracing (a traceparent on sampled events and uploads, web vitals, React render timing) to the compiled frontend; without an endpoint nothing is exported. Failed browser exports (for example a collector without CORS) are reported through the app's frontend_exception_handler. (#6227)
