chore: telemetry (#2240)

apps/documentation/pages/developers/self-hosting/how-to.mdx

@@ -318,6 +318,36 @@ The environment variables listed above are a subset of those available for confi
 | `NEXT_PUBLIC_POSTHOG_KEY`                    | The optional PostHog key for analytics and feature flags.                                           |
 | `NEXT_PUBLIC_DISABLE_SIGNUP`                 | Whether to disable user signups through the /signup page.                                           |
 | `NEXT_PRIVATE_BROWSERLESS_URL`               | The URL for a Browserless.io instance to generate PDFs (optional).                                  |
+| `DOCUMENSO_DISABLE_TELEMETRY`                | Set to `true` to disable anonymous telemetry (see [Telemetry](#telemetry) section below).           |
+
+## Telemetry
+
+Documenso collects anonymous telemetry data to help us understand how the software is being used and improve the product. This telemetry is **enabled by default** for self-hosted instances.
+
+### What We Collect
+
+We collect minimal, privacy-preserving data:
+
+- **App Version**: The version of Documenso you are running
+- **Installation ID**: A unique identifier for your installation (stored in your database)
+- **Node ID**: A unique identifier for each server/container instance (stored in the OS temp directory)
+
+We do **not** collect any personal data, document contents, user information, or usage patterns.
+
+### Events
+
+- **Server Startup**: Captured once when the server starts
+- **Server Heartbeat**: Captured every hour while the server is running
+
+### Disabling Telemetry
+
+To disable telemetry, set the following environment variable:
+
+```bash
+DOCUMENSO_DISABLE_TELEMETRY=true
+```
+
+This will completely disable all telemetry data collection.
 
 ## Run as a Service