“Week four’s sampling homework caught a bias in our canary traffic. I still struggle applying the same rigor to batch jobs — the course admits that gap.”
Flagship course
Signal Path Diagnostics
Six weeks of application analytics for framework runtime diagnostics — journey maps, sampling judgment, and a ritual that survives busy seasons.
₩890,000 Trace Companion seat · informational
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Modules
1 · Inventory without shame
Catalogue the signals you already emit. Name the ones nobody trusts.
2 · Journey maps that stay honest
Draw request paths across middleware; mark where spans go quiet.
3 · Sampling with a conscience
Protect rare stalls without recording every handshake.
4 · Metric softness
Retire vanity panels; keep counters that explain runtime pauses.
5 · Weekly diagnostic ritual
A 40-minute cadence for teams who refuse war-room aesthetics.
6 · Soft postmortem clinic
Present one story; receive peer critique on language and evidence.
Learning outcomes
- Produce a one-page signal map for a service you own
- Defend a sampling policy with numbers and edge cases
- Facilitate a soft postmortem without theatrical urgency
- Write runbook steps that cite specific analytics views
Instructor
Hana Yoon
Former platform engineer; teaches from Siheung with a bias toward readable traces and kind critiques.
Learner notes
★★★★☆
“Hana’s office hours untangled our OpenTelemetry exporter mess. The evening schedule suited Korea; US teammates watched recordings.”
FAQ
Do I need a specific framework?
No. Labs accept common HTTP frameworks in Node, Java, and Python. Bring the one you ship.
Is there a live payment on this site?
No. Pricing is informational. We invoice after a fit conversation.
What is a real limitation of this course?
We do not teach kernel-level profiling or vendor-specific query languages in depth. If your bottlenecks live below the framework boundary, you will still need specialized tooling — and we will say so early.
Can teams share one Trace Companion seat?
Seats are individual. For groups, see Fleet Observatory on the pricing page.