Kubernetes Accepted It. That Doesn't Mean It Works.

kubectl apply came back clean. Service created. Deployment rolled out. Pods running. And every request returns 503. The thing that took me a while to accept about Kubernetes is that a manifest being valid says almost nothing about whether it c…

Your Incident Probably Did Not Have a Root Cause

Read enough postmortems and you notice they all end the same way. One box, one sentence, usually naming a deployment. Root cause: bad deploy. It is tidy, it closes the ticket, and it is almost always an incomplete account of what happened. Worse, it q…

Is It Us, or Is It Them?

Checkout starts failing. Before anyone can fix anything, somebody has to answer one question, and everything downstream depends on it. Is this our code, or is a provider having a bad day? If it's ours, you're rolling back or shipping a fix…

Similar Code Is Not Connected Code

Ask an embedding-based system which code relates to PaymentService and you will get back things that look like PaymentService . Other payment classes. Functions with payment in the name. A test file. Possibly a payment integration in a completely dif…

I Shipped It. Six Months Later I Couldn't Explain It.

A bug came in on something I'd written. My name on the commit, my PR, merged and running for months. I opened the file and had no idea how it worked. Not a vague memory that needed refreshing. Genuinely blank. I'd reviewed that code, I'…

The Alert Knows the Pod. The Pod Doesn't Know the Commit.

An alert fires. Checkout latency, p95, over threshold. What you have been handed is a pod name and a number. What you need is a function in a file in a repository, changed by a commit, shipped by a deployment, roughly forty minutes ago. Between th…

The Feature Ends at a String Literal in Someone Else's Repository

Somebody asks how order creation works. You open the order service and start reading. POST /orders → OrderController.create() → OrderService.submit() → orders table → publish("order.created") And that's where the trail stops. Not bec…

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