Question 1

How do I set up log file rotation with slog?

Accepted Answer

Use handlers like MustRotateFile or NewTimeRotateFile from the handler package, which allow configuration for time-based or size-based rotation with options for compression and cleanup, as shown in the 'Log to file with automatic rotating' example.

Question 2

slog vs zap: which is better for performance in Go?

Accepted Answer

Benchmarks show zap is slightly faster in some tests, but slog offers more built-in features like rotation and easier extensibility. Choose zap for raw speed in high-throughput systems; opt for slog if you need integrated rotation and customization without extra dependencies.

Question 3

Can I use slog with other logging libraries like logrus?

Accepted Answer

Yes, the standalone rotatefile subpackage can wrap io.Writer for use with any logger, such as log, glog, or zap, as demonstrated in examples using rotatefile.Writer with Go's standard log package.

Question 4

How to add custom fields to JSON logs in slog?

Accepted Answer

Use methods like WithData or WithFields on the logger to attach structured data, or add Processors to modify records before handling, as explained in the Processor and JSON formatter sections.

Question 5

What are the benchmarks comparing slog to ZeroLog or PhusLog?

Accepted Answer

Benchmarks in the README show slog is slower than ZeroLog and PhusLog in both positive and negative tests, with PhusLog being about 3x faster in ns/op, so consider those libraries for extreme performance needs.

Question 6

How to integrate slog with GORM for database logging?

Accepted Answer

Refer to the GitHub issue link under 'Use slog in GORM' in the README, which provides community-driven examples and discussions on configuring GORM to use slog for its log output.

Question 7

Does slog support buffered writing to files?

Accepted Answer

Yes, it supports buffer modes via Config or Builder options, such as BuffModeLine for line-based buffering, to improve write performance and avoid truncation, detailed in the 'About BuffMode' section.

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