The worst kind of outage is one nobody notices. Your metrics are green. Your dashboards are fine. Your users are quietly getting a broken experience. I've been burned by three silent outages in my career. Here's how I catch them now. How silent outages happen Frontend caching the error. Your API returned a 500. Your CDN cached it. Now all users get the cached error for 10 minutes, but your API health check passes because the CDN never re-asks. Partial feature breakage. ...