Fluentd is an open source data collector designed to scale and simplify log management. It can collect, process and ship many kinds of data in near real-time.

Tame Rails' multi-line logging into a single line per request

A gem that provides a client interface for the Sentry error logger

**Logging** is a flexible logging library for use in Ruby programs based on the design of Java's log4j library. It features a hierarchical logging system, custom level names, multiple output destinations per log event, custom formatting, and more.

Provides a simple logging utility for outputting messages.

See also: http://logging.apache.org/log4j

A lock-free logger compatible with Ruby 2.0. Ruby does not allow you to request a lock in a trap handler because that could deadlock, so Logger is not sufficient.

Feature rich logging framework, and replacement for existing Ruby & Rails loggers.

Ruby logger that writes directly to LogStash

Feature rich logging framework that replaces the Rails logger.

This is an experiment to try and make logging more flexible and more consumable. Plain text logs are bullshit, let's emit structured and contextual logs. Metrics, too!

fluent logger for ruby

Library to send GELF messages to Graylog logging server. Supports plain-text, GELF messages and exceptions via UDP and TCP.

Log outgoing HTTP requests made from your application. Helpful for tracking API calls of third party gems that don't provide their own log output.

An improved Logger replacement that logs to syslog. It is almost drop-in with a few caveats.

A structured logging system is capable of handling a message, custom data or an exception easily. It has JSON formatters compatible with Bunyan or pino for Node.js and human readable formatter with Amazing Print for console.

Yell - Your Extensible Logging Library. Define multiple adapters, various log level combinations or message formatting options like you've never done before

A Railtie for for integrating the [Logging](https://github.com/TwP/logging) framework into your Rails 3 application.

A way to add context to the logs you have

This gem keeps an eye on every Net::HTTP library usage and dumps all request and response data to the log file.

MongoDB logger for Rails

Logging for Ruby