Frontend errors are product signals, not just developer noise
Runtime errors, failed fetches, and broken resources often explain why real visitors cannot complete important actions.
The browser is where many failures become visible
Server metrics can look healthy while a visitor sees a broken button, a failed API call, or an image that never loads. Frontend diagnostics capture what happened in the browser and tie it back to the session.
The most useful logs are contextual
A log message by itself is rarely enough. Teams need the page, session, device, browser, country, and nearby actions. That context helps explain whether an error is isolated noise or a real experience problem.
- JavaScript runtime errors and unhandled promise rejections
- Network/API failures from fetch and XMLHttpRequest
- Broken scripts, stylesheets, and images
- Manual product logs through window.heronsignal.log
- Business events through window.heronsignal.event
Better diagnostics reduce guessing
Instead of asking users for screenshots or trying to reproduce an issue blindly, teams can open the affected session journey and see what happened before the failure.
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