You can't tune what you can't see: prompt‑cache observability for GitHub Copilot with OpenTelemetry

Wed, 08 Jul 2026 12:42:31 +0000

Open VS Code, ask Copilot Chat one question, and if you crack open the debug view you can watch prompt‑cache tokens tick past for that single call. That’s exactly enough visibility for one developer, on one machine, for one prompt. It stops being enough the moment you want to answer a sharper question:

Opentelemetry on Agentic Engineering in Action (agentprose demo)

You can't tune what you can't see: prompt‑cache observability for GitHub Copilot with OpenTelemetry