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.

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.

Provides a simple logging utility for outputting messages.

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

Ruby logger that writes directly to LogStash

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!

Feature rich logging framework that replaces the Rails logger.

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.

MongoDB logger for Rails

A way to add context to the logs you have

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

Lumber tries to make it easy to use the more robust log4r logging system within your rails application. To do this it sets up log4r configuration from a yml file, and provides utility methods for adding a :logger accessor to classes dynamicaly as they get created.