wtf is cybozu-go-log?

cybozu-go/log is a tool built in the Go programming language that helps applications keep track of what they are doing by recording messages, commonly known as logs. When software runs, it generates these logs to document events, errors, or status updates, much like a ship's captain keeping a daily logbook. This project provides a structured way for Go programs to write those records, originally created for the internal products of a company called Cybozu. The tool is described as a "framework" rather than a simple library, meaning it has strict opinions about how logging should work and intentionally limits how much you can customize its features. It is designed to be fast and light on computer resources. It formats text in a single pass with a hard-coded maximum size limit, allowing it to process about 340,000 log entries per second. It can write logs in plain text by default, but also supports structured formats like logfmt and JSON Lines, which make the logs easier for other programs to read and analyze. A few built-in features make it practical for everyday use. If a Go program is already using the language's standard built-in logging system, this framework will automatically take over and redirect those records into its own system. It also includes a feature that helps work with log rotation programs, tools that archive old logs and start fresh files. When it receives a specific signal, it will close and reopen the log file, which is a necessary step for smoothly handing off old files to an archiving tool without interrupting the running application. This specific file reopening feature is only available on non-Windows systems. This tool is meant for developers building applications in Go who want a highly efficient, no-fuss way to handle logging. Because it prioritizes speed and low resource usage over deep customization, it is best suited for teams that prefer a rigid, pre-configured system over a highly flexible one they have to tune themselves. The project's documentation points to additional resources for understanding the exact structure of the logs and how to implement the code.