title: Sending session_id via Measurement Protocol
body: <p>I have front-end GA4 implementation and want to send transactions data (and some custom events) from the server via MP. With recomendations of Google to</p>
  <blockquote>
  <p>include session_id as a param, so that measurement protocol events
  appear in session-based reporting</p>
  </blockquote>
  <p>is it better to get session_id from gtag.js or generate random session_id?</p>