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# Stackdriver Trace Instrumentation Then google-cloud-trace gem provides a Rack Middleware class that integrates with Rack-based application frameworks, such as Rails and Sinatra. When installed, the middleware collects performance traces of requests and, subject to sampling constraints, submits them to the Stackdriver Trace service. Additionally, the google-cloud-trace gem provides a Railtie class that automatically enables the Rack Middleware in Rails applications when used. ## Configuration The default configuration enables Stackdriver instrumentation features to run on Google Cloud Platform. You can easily configure the instrumentation library if you want to run on a non Google Cloud environment or you want to customize the default behavior. See the [Configuration Guide](https://googleapis.dev/ruby/stackdriver/latest/file.INSTRUMENTATION_CONFIGURATION.html) for full configuration parameters. ## Rails Integration To use the Stackdriver Logging Railtie for Ruby on Rails applications, simply add this line to `config/application.rb`: ```ruby require "google/cloud/trace/rails" ``` Alternatively, check out the [stackdriver](https://googleapis.dev/ruby/stackdriver/latest) gem, which enables this Railtie by default. ## Rack Integration Other Rack base frameworks can also directly leverage the built-in Middleware. ```ruby require "google/cloud/trace" use Google::Cloud::Trace::Middleware ``` ## Faraday Middleware On top of the Rack Middleware, you can also trace outbound Faraday requests by using the Faraday Middleware provided with this gem: ```ruby require "google/cloud/trace/faraday_middleware" conn = Faraday.new "https://www.google.com" conn.use Google::Cloud::Trace::FaradayMiddleware result = conn.get ``` A child span will be create for each outbound Faraday request, and will be submitted together with the overall application request trace by the Rack Middleware.
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24 entries across 24 versions & 2 rubygems