Synthetic Monitoring | John Nessime

Post-Migration Checklist: What Breaks Quietly in the First 48 Hours

Post category:DevOps System Administration Technical Guides

Migrations rarely fail loudly. The site stays up while mail, cron, certificate renewal and the write path break silently behind it. A post-migration checklist for the first 48 hours, ordered by how long each failure can hide rather than by subsystem.

Synthetic vs Real User Monitoring: What Your Green Dashboard Isn’t Telling You

Post category:DevOps Web Performance

Uptime checks and RUM measure different things, and each one is structurally blind to failures the other catches. A practical breakdown of what synthetic probes miss, why RUM goes quiet during a real outage, and how to combine them without paying for two overlapping platforms.