erlang-lager/lager

Health v2 · maintenance only

Adoption not part of the score

1130 stars · 445 forks observed · 2026-08-28

What it is AI-extracted, prompt v1, taxonomy v1, 2026-08-30, confidence not recorded

Lager is a logging framework for Erlang/OTP that provides fine-grained log levels, multiple backends and sinks, and integration with UNIX tools like syslog and logrotate. It uses a parse transform to capture module/function/line/pid context and includes features like load shedding and log rotation.

Use cases

• add structured logging to an Erlang/OTP application
• rotate log files by time or size
• integrate Erlang logging with syslog
• filter log messages by severity level
• prevent log flooding from crashing the node
• pretty-print records in log output

When to choose

• you are building an Erlang/OTP application and need robust, configurable logging
• you want syslog/logrotate compatibility and multiple log backends
• you need protection against oversized log volumes via load shedding

When to avoid

• you are using Erlang/OTP's built-in logger (OTP 21+) and prefer standard library logging
• your project is not written in Erlang
• you need logging for a platform outside the BEAM ecosystem

Facets

library · maturity active

logging developer-tools backend windows elixir erlang otp log-rotation syslog parse-transform linux macos

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