Live coding with Ryan Dahl: Deno and OpenTelemetry
summary
Live coding shows a small API that randomly throws when a generated user ID starts with "a" and how Deno auto-instruments it so trace IDs attached to console logs make the bug trivial to find under load. Demo uses Hono, curl and Graphana, Deno 2.2 adds auto-instrumenting with one trace per HTTP request and spans for inbound/outbound calls, and exporting to observability backends works with no app code changes.
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chapters (9)
- 0:00Deno and OpenTelemetry intro
- 1:48Debugging production challenges
- 2:51Live coding buggy service
- 8:43Fixing the bug with OpenTelemetry
- 12:26Async context for automatic tracing
- 13:31Deno 2.2 built-in telemetry
- 15:20Telemetry in Deno Deploy
- 17:55JavaScript trademark digression
- 19:22Q&A
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