golang-samber-slog

Structured logging in Go with sampling and PII scrubbing is set up by composing multi-handler pipelines using samber/slog-multi and slog-formatter to drop noisy logs and format email or IP fields before routing to back-ends.

Slog sampling works by using the slog-sampling library to drop noisy logs before they are formatted, reducing log volume in Go applications by intercepting records early in the multi-handler pipeline.

You can use slog pipelines with HTTP middleware in Go frameworks like Gin, Echo, Fiber, and Chi to inject request IDs and trace information into your structured logs.

You need Go 1.21 or higher to use samber/slog packages for logging pipelines, as the structured logging pipeline relies on the native slog package introduced in that version.

The best way to route Go logs to multiple back-ends like Sentry and Loki is using slog-multi Fanout patterns to send errors to Sentry and all logs to Loki simultaneously within a single pipeline configuration.

You integrate OpenTelemetry trace IDs with Go slog pipelines by using HTTP middleware to inject trace information into log records, ensuring observability context is preserved across distributed systems.