title: Does prometheus golang (echo-contrib) exporter saves metrics in memory?
body: <p>I have a GoLang middleware for exporting metrics for prometheus, which are then served from <code>/metrics</code> endpoint</p>
  <p>My question is where does the data received from <code>/metrics</code> endpoint come from?
  Does it come from the memory?</p>
  <p>Exporter link: <a href="https://github.com/labstack/echo-contrib/tree/master/prometheus" rel="nofollow noreferrer">https://github.com/labstack/echo-contrib/tree/master/prometheus</a></p>