Performance, Measured: Percentiles, Profiling and the Laws That Decide What's Worth Optimizing
The single most expensive habit in performance work is optimizing by gut feel…
Tag
#observability
22 posts
Your AI Bill Just Spiked: How to Debug It and Pinpoint the Cause
The invoice email lands and your AI spend is 4× last week. The instinct is to…
Observability & Production Debugging — From the Three Pillars to Debugging a Live Incident
Every engineer eventually faces the same 2 AM moment: something is wrong in…
Cost, Cardinality & Scale
There’s a trap waiting at scale that nobody warns you about until the invoice…
Debugging a Live Incident
Everything in this course has been building toward this moment: it’s 2 AM, an…
Performance Debugging
“It’s slow” is one of the most common and most slippery problems in production…
SLOs, SLIs & Error Budgets
“Is the service reliable enough?” is a question teams argue about endlessly and…
Alerting & On-Call
An alert is a promise to interrupt a human — to pull them out of dinner, out of…
Distributed Tracing
Metrics tell you something is slow; logs tell you what happened at one point…
OpenTelemetry
The previous lessons showed what to emit — structured logs, metrics, traces…
Structured Logging Done Right
Logs are the oldest and most familiar observability signal — everyone has…
Why Observability
Every engineer who’s run software in production knows the feeling: an alert…
The Three Pillars
Observability rests on three kinds of telemetry, usually called the three…
Metrics & Time Series
Metrics are the workhorse of observability — the cheap, aggregatable numbers…
Dashboards That Aren't Noise
You’ve collected logs, metrics and traces. Now a human has to use them — often a…
Security, Ops + Capstone
Everything so far gets your app running on Kubernetes. This final lesson is…
Observability + Capstone: Designing and Debugging a Distributed System
Here’s a question I like to ask in interviews: “A customer says checkout took 1…
AI Agent Development — From First Loop to Production
Every second LinkedIn post today is about AI agents. Most of them show a demo…
Debugging and Observability for AI Agents
A support executive pinged me on a Saturday morning: “The bot told a customer…
LLM Engineering in Production
Most LLM tutorials stop at “call the API and print the result.” Production doesn…
LLM Observability and Monitoring
Traditional application monitoring asks: “Is the server up? Is latency…
CloudWatch — Building Real Observability
Observability is not about collecting data. It is about answering questions when…