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 m...

Source: [Dev.to](https://dev.to/masonwritescode/the-backend-was-green-and-the-video-kept-buffering-a-qoe-debugging-playbook-1kcg)

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