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Mutation Testing in 2026: Stop Trusting Coverage, Start Killing Mutants

Posted on October 16, 2026 teliaz

Every test suite has a hidden layer of confidence that coverage numbers never touch. A line can be executed by

Continue readingMutation Testing in 2026: Stop Trusting Coverage, Start Killing Mutants

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RAG Chunking Is Not Settled: What Token-Level Evaluations Actually Show

Posted on October 14, 2026 teliaz

Every RAG pipeline starts with the same piece of code: split documents into chunks, embed them, store them. It looks

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Cat Links Software Engineering

Prometheus Cardinality: Why Your TSDB Is Drowning and How to Stop It

Posted on October 12, 2026October 13, 2026 teliaz

Eventually the alert fires at 3 a.m.: your Prometheus is consuming more memory than the database it monitors, queries that

Continue readingPrometheus Cardinality: Why Your TSDB Is Drowning and How to Stop It

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Continuous Batching: The Scheduling Trick Behind Every Fast LLM Server

Posted on October 12, 2026 teliaz

Every team that serves language models eventually hits the same wall: the GPU has plenty of memory and the model

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Cat Links Software Engineering

Structured Logging in Go: A Practical slog Field Guide

Posted on October 10, 2026October 11, 2026 teliaz

Every codebase has a logging moment of reckoning. It arrives when someone has to debug a production incident at 2

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Cat Links Software Engineering

Zero-Downtime PostgreSQL Migrations: Locks, Rewrites, and Expand-and-Contract

Posted on October 3, 2026October 4, 2026 teliaz

Every schema migration is easy the first time, when the table is empty and the only user is your test

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Cat Links Software Engineering

The Go Garbage Collector in Production: GOGC, GOMEMLIMIT, and Allocation Discipline

Posted on October 3, 2026October 4, 2026 teliaz

Most Go services run for months without anyone touching a single GC knob, and that is exactly how the runtime

Continue readingThe Go Garbage Collector in Production: GOGC, GOMEMLIMIT, and Allocation Discipline

Cat Links Software Engineering

Structured Logging in Go With slog: Handlers, Sampling, and Dynamic Levels

Posted on September 28, 2026September 29, 2026 teliaz

A request fails at 2 AM. The on-call engineer greps through logs looking for a trace ID, finds seventeen lines

Continue readingStructured Logging in Go With slog: Handlers, Sampling, and Dynamic Levels

Cat Links Software Engineering

Prometheus Cardinality Explosions: Why Your Monitoring Server Ran Out of Memory

Posted on September 24, 2026 teliaz

Every Prometheus outages post-mortem tells the same story in a slightly different costume. The server ran fine for months, then

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Cat Links Software Engineering

Five Code Gems From Quake, Redis, Linux, Python, and SQLite — and What They Teach

Posted on September 24, 2026 teliaz

Some code teaches you an algorithm. Some code teaches you a way of thinking. The snippets below are in the

Continue readingFive Code Gems From Quake, Redis, Linux, Python, and SQLite — and What They Teach

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