The session start event did not arrive in Amplitude. How will you analyze it? What if the request didn't go through at all?

To analyze the absence of a Session start event in Amplitude, you should:

1. Check if the event is being sent from the application:

   • Look at the client logs to ensure the send event call is happening.
   • Use developer tools (e.g., Network tab in the browser) to verify if the request is reaching the Amplitude server.

2. If the request is not being sent at all:

   • Check network settings, blocks (e.g., CORS, firewall).
   • Verify if the code is blocking the event sending (e.g., a condition that does not trigger).
   • Ensure the Amplitude SDK is initialized correctly.

3. If the request is sent but the event does not appear:

   • Check the response from the Amplitude server to the request (status, errors).
   • Review project settings in Amplitude (API key, filters).
   • Verify if the event is being filtered on the Amplitude side.

4. Use the SDK's debug mode, if available, for detailed logging.

5. Check if network state or caching affects event sending.

Thus, the analysis starts with checking the event sending on the client side and ends with processing verification on the Amplitude side.