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README.md

Application Insights SDK for Ruby

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Ruby is a dynamic, open source programming language with a focus on simplicity and productivity. It has an elegant syntax that is natural to read and easy to write. -- Ruby - Official Site

This project extends the Application Insights API surface to support Ruby. Application Insights is a service that allows developers to keep their application available, performing and succeeding. This Ruby gem will allow you to send telemetry of various kinds (event, trace, exception, etc.) to the Application Insights service where they can be visualized in the Azure Portal.

Requirements

Ruby 1.9.3 and above are currently supported by this gem.

Installation

To install the latest release you can use gem.

$ gem install application_insights

Usage

Once installed, you can send telemetry to Application Insights. Here are a few samples.

Note: before you can send data to you will need an instrumentation key. Please see the Getting an Application Insights Instrumentation Key section for more information.

Sending a simple event telemetry item

require 'application_insights'
tc = ApplicationInsights::TelemetryClient.new '<YOUR INSTRUMENTATION KEY GOES HERE>'
tc.track_event 'My event'
tc.flush

Sending an event telemetry item with custom properties and measurements

require 'application_insights'
tc = ApplicationInsights::TelemetryClient.new '<YOUR INSTRUMENTATION KEY GOES HERE>'
tc.track_event 'My event', :properties => { 'custom property' => 'some value' }, :measurements => { 'custom metric' => 13 }
tc.flush

Sending a trace telemetry item with custom properties

require 'application_insights'
tc = ApplicationInsights::TelemetryClient.new '<YOUR INSTRUMENTATION KEY GOES HERE>'
tc.track_trace 'My trace statement', ApplicationInsights::Channel::Contracts::SeverityLevel::INFORMATION, :properties => { 'custom property' => 'some value' }
tc.flush

Sending a metric telemetry item (without and with optional values)

require 'application_insights'
tc = ApplicationInsights::TelemetryClient.new '<YOUR INSTRUMENTATION KEY GOES HERE>'
tc.track_metric 'My metric', 42
# with all optional values set
tc.track_metric 'My metric', 42, :kind => ApplicationInsights::Channel::Contracts::DataPointType::AGGREGATION, :count => 3, :min => 1, :max => 100, :std_dev => 10, :properties => { 'custom property' => 'some value' }
tc.flush

Sending an exception telemetry item with custom properties and measurements

require 'application_insights'
tc = ApplicationInsights::TelemetryClient.new '<YOUR INSTRUMENTATION KEY GOES HERE>'
begin
  raise ArgumentError, 'Something has gone wrong!'
rescue => e
  tc.track_exception e
end
tc.flush

Configuring context for a telemetry client instance

require 'application_insights'
tc = ApplicationInsights::TelemetryClient.new '<YOUR INSTRUMENTATION KEY GOES HERE>'
tc.context.application.ver = '1.2.3'
tc.context.device.id = 'My current device'
tc.context.device.oem_name = 'Asus'
tc.context.device.model = 'X31A'
tc.context.device.type = "Other"
tc.context.user.id = 'santa@northpole.net'
tc.track_trace 'My trace with context'
tc.flush

Configuring synchronous (default) channel properties

require 'application_insights'
tc = ApplicationInsights::TelemetryClient.new
# flush telemetry if we have 10 or more telemetry items in our queue
tc.channel.queue.max_queue_length = 10
# send telemetry to the service in batches of 5
tc.channel.sender.send_buffer_size = 5

Configuring an asynchronous channel instead of the synchronous default

require 'application_insights'
sender = ApplicationInsights::Channel::AsynchronousSender.new
queue = ApplicationInsights::Channel::AsynchronousQueue.new sender
channel = ApplicationInsights::Channel::TelemetryChannel.new nil, queue
tc = ApplicationInsights::TelemetryClient.new '<YOUR INSTRUMENTATION KEY GOES HERE>', channel
# Note: the event will be sent on a separate thread; if the app finishes before
#       the thread finishes, the data is lost
tc.track_event 'My event'

Configuring asynchronous channel properties

require 'application_insights'
sender = ApplicationInsights::Channel::AsynchronousSender.new
queue = ApplicationInsights::Channel::AsynchronousQueue.new sender
channel = ApplicationInsights::Channel::TelemetryChannel.new nil, queue
tc = ApplicationInsights::TelemetryClient.new '<YOUR INSTRUMENTATION KEY GOES HERE>', channel
# flush telemetry if we have 10 or more telemetry items in our queue
tc.channel.queue.max_queue_length = 10
# send telemetry to the service in batches of 5
tc.channel.sender.send_buffer_size = 5
# the background worker thread will be active for 5 seconds before it shuts down. if
# during this time items are picked up from the queue, the timer is reset.
tc.channel.sender.send_time = 5
# the background worker thread will poll the queue every 0.5 seconds for new items
tc.channel.sender.send_interval = 0.5

Collecting unhandled exceptions

require 'application_insights'
# setup unhandled exception handler
ApplicationInsights::UnhandledException.collect('<YOUR INSTRUMENTATION KEY GOES HERE>')
# raise an exception and this would be send to Application Insights Service
raise Exception, 'Boom!'

Collecting requests for rack applications

# set up the TrackRequest middleware in the rackup (config.ru) file
require 'application_insights'
use ApplicationInsights::Rack::TrackRequest, '<YOUR INSTRUMENTATION KEY GOES HERE>', <buffer size>
# For rails, suggest to set up this middleware in application.rb so that unhandled exceptions from controllers are also collected
config.middleware.use 'ApplicationInsights::Rack::TrackRequest', '<YOUR INSTRUMENTATION KEY GOES HERE>', <buffer size>

Rerieving the Request-Id value from ApplicationInsights

# from time to time you may need to access a request's id from within your app
application_insights_request_id = request.env['ApplicationInsights.request.id']

# this can be used for a number of different purposes, including telemetry correlation
uri = URI('http://api.example.com/search/?q=test')

req = Net::HTTP::Get.new(uri)
req['Request-Id'] = "#{application_insights_request_id}1" if application_insights_request_id

Net::HTTP.start(uri.hostname, uri.port) { |http| http.request(req) }