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.

Provides a simple logging utility for outputting messages.

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

**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.

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

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.

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

A way to add context to the logs you have

MongoDB logger for Rails

Lightweight structured logging for Ruby applications

Hybrid action logging, consisting of standard and custom logging.

clogger is Rack middleware for logging HTTP requests. The log format is customizable so you can specify exactly which fields to log.

Logging library that provides the ability to add class/module specific filters

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.

Check and search logs from dashboard, use hightlight to spot easily, add hourly rotation if needed.

Captures raketask output along with additional information (task name, duration, start time, error) for further usage.

Wraps logging in a nice and convenient way making it easy to apply on any project

The official justlogging.com gem

A Rails engine which receives logs and provides an interface for them

Navigating noise in your log files can be like trying to cross a busy road and avoid the cars. Frogger makes your log files more fun by adding some good ol' 8 bit color and a bit of formatting.