🔧 The backend was green and the video kept buffering: a QoE debugging playbook

TL;DR


Backend metrics can't see rebuffering, slow startups, or failed plays; those happen inside the player. We'll instrument an HTML5/hls.js player to capture real QoE signals in ~40 lines, look at what the numbers mean, and then be honest about where DIY telemetry stops scaling and what the managed options cost.

📦 Code:...