How to debug in 2025: logs, traces, and metrics @deno

Uploaded April 2025 | Updated September 2026, 3 weeks ago

In these four demos, Luca shows how to simplify your debugging experience.

00:00 How to associate your logs with an HTTP request
01:51 How to include child spans in your traces
03:34 How to track traces across services
04:37 How to capture metrics and set alerts

Check out the entire talk here:
youtube.com/watch?v=ZrgE5zDkQDY

Read the accompanying blog post:
deno.com/blog/zero-config-debugging-deno-opentelemetry

Deno is an all-in-one batteries included JavaScript and TypeScript toolchain.

Website: deno.com
GitHub: github.com/denoland
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How to debug in 2025: logs, traces, and metrics

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$Safe Cloud Code Execution with Snapshots (Python Pre-Installed, Zero Wait) Deno Sandbox lets you spin up isolated cloud VMs programmatically. With the snapshots feature, you can pre-install an entire environment once and boot it without waiting for installs every time after. In this video I show you the snapshot workflow end to end: → Create a cloud volume and boot a sandbox → Install Python, and required packages and build tools → Snapshot the volume — your environment is now frozen and reusable → Boot fresh sandboxes from that snapshot instantly, with everything pre-installed As a demo we run a live interactive Mandelbrot fractal explorer. An HTTP server deployed entirely inside the sandbox, the code never touching the host machine. This is the foundation for safe execution of AI-generated code, user-submitted scripts, or any workload you want fully isolated and reproducible. Chapters: 0:00 – Introduction 0:50 – Initialize a basic Deno project 1:40 – Setting up a Snapshot 3:25 – Booting from a Snapshot Resources: 📂 Code: https://docs.deno.com/examples/snapshot_python_tutorial 🚀 Deno Deploy: https://console.deno.com 📦 Deno Sandbox SDK: https://jsr.io/@deno/sandbox$