Errors and Logs: Configure Ruby Applications

Retrace does not support APM for Ruby applications but you can capture errors and log and view them within Retrace. To configure your Ruby project with the Stackify API to send Errors and Logs to Retrace, follow the information below.

Stackify API for Ruby Github page: https://github.com/stackify/stackify-api-ruby.

Installation and Configuration

Requirements:

  • Ruby 1.9/2.0/2.1
  • Rails 3.x/4.x (optional)

Rails

Add the stackify gem to your Gemfile. In Gemfile:

gem 'stackify-api-ruby'

Run the bundle command to install it:

$ bundle

or install it manually:

$ gem install stackify-api-ruby

After you install stackify-api-ruby you need to run the generator:

$ rails g stackify --api_key=your_api_key

The generator creates a file ‘config/initializers/stackify.rb’ configuring stackify-api-ruby with your API key. You can change default settings there.

Non-Rails

For using stackify-api-ruby gem within any Ruby application add to top of your main file:

require 'stackify-api-ruby'

After that you need to make base configuration:

Stackify.setup do |config|
  config.api_key = "your_api_key"
  config.env = :development
  config.app_name = "Your app name"
end

Optional Configuration

Gem has 3 modes of work – “both”, “logging”, “metrics”. Mode “both” turns on both parts of gem – logging and metrics. If you need ONLY logging or metrics use “logging” or “metrics” mode accordingly.

config.mode = :metrics

If you want to use proxy for sending request, you can do it in such way:

config.proxy = { uri: '127.0.0.1:8118', user: 'user_name', password: 'some_password' }

Log API Usage

Rails

stackify-api-ruby starts with start of Rails. Every error, which occurs within your application, will be caught and sent to Retrace automatically. The same situation with logs – you just use the Rails logger as usual:

Rails.logger.info "Some log message"

If you want to redefine logger, you should add

config.logger = ::Stackify::LoggerProxy.new(ActiveSupport::Logger.new(Rails.root.join('log', "#{Rails.env}.log")))

to your config/environments/%environment%.

In this case Stackify#config.log_level will affect entire system.

Non-Rails

After logs configuring you should wrap up your logger:

logger = Logger.new('mylog.log')
logger = Stackify::LoggerProxy.new(logger)

And last thing you need to do – call method “run”:

Stackify.run #remember that this call is running in the background of your main script

Metrics API Usage

There are four different types of metrics:

  • Gauge: Keeps track of the last value that was set in the current minute
      Stackify::Metrics.set_gauge "MyCategory", "MyGauge", 100<span id="mce_marker" data-mce-type="bookmark" data-mce-fragment="1">​</span>
  • Counter: Calculates the rate per minute
      Stackify::Metrics.count "MyCategory", "MyCounter"<span id="mce_marker" data-mce-type="bookmark" data-mce-fragment="1">​</span>
  • Average: Calculates the average of all values in the current minute
      Stackify::Metrics.average "MyCategory", "AverageSpeed", 200<span id="mce_marker" data-mce-type="bookmark" data-mce-fragment="1">​</span>
  • Timer: Calculates the average elapsed time for an operation in the current minute
      t = Time.now
      Stackify::Metrics.time "MyCategory", "ElapsedTime", t
      # or
      Stackify::Metrics.time_duration "MyCategory", "ElapsedTime", 5.seconds<span id="mce_marker" data-mce-type="bookmark" data-mce-fragment="1">​</span>
  • Counter and Timer: Composite of the Counter and Timer metrics for convenience
      t = Time.now
      Stackify::Metrics.count_and_time "Metric", "CounterWithTime", t<span id="mce_marker" data-mce-type="bookmark" data-mce-fragment="1">​</span>

We can configure every metric with settings:

    settings = Stackify::Metrics::MetricSettings.new
    settings.autoreport_zero_if_nothing_reported = true
    # or
    settings.autoreport_last_value_if_nothing_reported = true
    Stackify::Metrics.set_gauge "MyCategory", "MyGauge", 100 , settings

“autoreport_last_value_if_nothing_reported” property has influence only on “average” metric.

Troubleshooting

If there are problems, you can enable internal logging of the stackify-api-ruby project. Uncomment out the config.logger and config.logger.level lines in the ‘config/initializers/stackify.rb’ file:

config.logger = Logger.new(Rails.root.join("log", "stackify.log"))
config.logger.level = Logger::DEBUG