Network Error

This signal tracks the user's failed network requests — with an error status code — during the session; unlike a JavaScript error, which happens client-side, a Network Error usually points to a problem on the server side, the user's connection, or a specific endpoint.

This metric acts as your gauge of infrastructure health and what's happening behind the scenes. Imagine you have a form or page whose data sometimes fails to load, but you don't know if the problem is on your server or the user's end; Network Error isolates exactly those sessions. Replaying them usually shows the user hitting an error message or a blank page and waiting — a direct clue for prioritizing server-side fixes.