Cache Hit Rate from 58% to 94%: Building a CDN Monitoring System and 5 Production-Grade Troubleshooting Decisions
Overview After deploying a CDN, many teams stop at glancing at the hit rate number on the vendor’s console. Hit rate at 90%? Looks fine, moving on. Then one day the origin bandwidth gets maxed out, pages take 8 seconds to load, user complaints flood in — and you discover that 90% was the request hit rate, not the byte hit rate. Large files were all going back to origin, while small requests inflated the number....