add doc page for telemetry info and opt-out

docs/api-reference/telemetry.md

@@ -0,0 +1,30 @@
+# Telemetry
+
+Reflex collects anonymized usage statistics — counts of components and built-in features used at compile time, along with versions of Reflex, Python, and the host OS — so we can prioritize bug fixes and guide the future direction of the framework. We do **not** collect the contents of your source files, state, or any data your app handles at runtime.
+
+For full details, see our [Privacy Policy](https://build.reflex.dev/privacy-policy) and [Terms of Service](https://build.reflex.dev/terms-of-use).
+
+If you log in to [Reflex Cloud](/docs/hosting/deploy-quick-start/), your Cloud account identifier is associated with subsequent usage events from that machine.
+
+## Opt out
+
+In your `rxconfig.py`:
+
+```python
+import reflex as rx
+
+config = rx.Config(
+    app_name="my_app",
+    telemetry_enabled=False,
+)
+```
+
+Or via environment variable:
+
+```bash
+REFLEX_TELEMETRY_ENABLED=false reflex init --template blank
+```
+
+The environment variable is the only supported opt-out method for reflex
+commands executed outside the context of an app directory, such as `reflex
+login` and `reflex init`.

docs/app/reflex_docs/templates/docpage/sidebar/sidebar_items/reference.py

@@ -17,6 +17,7 @@ def get_sidebar_items_api_reference():
                 api_reference.browser_javascript,
                 api_reference.plugins,
                 api_reference.utils,
+                api_reference.telemetry,
             ],
         )
     ]