The DeployWatchers blog
Practical guides to monitoring websites and finding the problems that appear after deployment.
A blue-green release stopped after we tightened hostname validation. We traced the rejection to the probe’s HTTP Host and corrected it without weakening protection.
Read article Host Protection Blocked Our Deploy: Why a Healthy Container Failed Readiness →An unfamiliar domain displayed our branding and privacy policy. The investigation led back to our own origin server and a missing HTTPS virtual-host boundary.
Read article Another Domain Showed Our Website: How We Fixed Nginx Host Routing →A successful rollout needs evidence from the application, browser and background workers. Use a focused checklist before and after moving public traffic.
Read article Laravel Post-Deploy Checklist: Verify the Release Beyond a Green Health Check →A blocked script may need a nonce, a different directive or a corrected upstream header. Trace the actual restriction before expanding the policy.
Read article CSP Blocks Required Scripts: Diagnose the Directive and Fix Trust Narrowly →A redesign can change both search visibility and how visits are measured. Establish which changed, then inspect the public signals page by page.
Read article Search Traffic Fell After a Redesign: Check Robots, Redirects and Indexing Signals →An enabled renewal task is not evidence that clients receive a fresh certificate. Follow the path from issuance to the TLS endpoint and check each boundary.
Read article SSL Expired Despite Auto-Renewal: Check Delivery, Expiry and Cloudflare's Origin →A scheduled process can start regularly and still fail to deliver its result. Place the signal after useful work and test what happens when it never arrives.
Read article Cron Job Monitoring with Heartbeats: Detect Missing Work Without Hiding Failures →Older tabs can request files that a new release has removed. Separate a missing build artifact from a compatibility gap, then test both sides of the deployment.
Read article CSS and JavaScript 404 After Deploy: Keep Older Vite Pages Working →A clean local run does not recreate a production browser. Preserve the failing release, page state and resource evidence before a refresh hides the problem.
Read article JavaScript Errors Only in Production: How to Detect and Diagnose Them →Reliable screenshot comparisons start with a trustworthy reference and consistent capture conditions. Learn what to compare and when to approve a replacement.
Read article Visual Monitoring After a Release: Baselines, Full Pages and False Alarms →A successful document response can hide a failed checkout or an unusable interface. Build a monitoring plan around the tasks your visitors need to complete.
Read article 200 OK but the Website Is Broken: What Uptime Checks Miss →A running PHP-FPM container can still be unreachable from Nginx. Check the listener address and the caller's network before changing application code.
Read article 502 After Deploy: Fix a PHP-FPM Listener That Nginx Cannot Reach →