README.md

Experimental! OpenTelemetry Logs for Ruby Demo

This is a minimal Rails 7.0 / Ruby 3.2 application demonstrating how to use an experimental implementation of OpenTelemetry logs for Ruby.

PRs for the gems used in this example can be found at:

• kaylareopelle/opentelemetry-ruby
• kaylareopelle/opentelemetry-ruby-contrib

There are three key files in this repository:

• Gemfile: Includes the gems installed from the necessary git, branch, and blob sources
• config/initializers/opentelemetry.rb: Configures OpenTelemetry to use the experimental logs
• app/controllers/test_controller.rb: TestController#index demonstrates how to emit your own logs and how indpendent Ruby Loggers work with auto-instrumentation

If you'd like to see just the Gemfile and an example opentelemetry.rb initializer, visit this gist.

Prerequisites:

• Ruby 3.2

Setup:

• Fork and clone the repo locally
  • Fork the repository inside GitHub
  • Run git clone git@github.com:<gh username>/newrelic-ruby-agent.git locally
  • cd into your new repository
• Run bundle install to install the gems for the application

Running the app:

• Run: bin/rails s
• Visit: localhost:3000
• See the OpenTelemetry logs in your console

If you'd like to see how logs would look with your observability vendor, update the config/initializers/opentelemetry.rb file to send the data to your vendor of choice.

Example OpenTelemetry log:

#<struct OpenTelemetry::SDK::Logs::LogRecordData
 timestamp=2024-04-19 15:06:50.118496 -0700,
 observed_timestamp=2024-04-19 15:06:50.118496 -0700,
 trace_id="\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00",
 span_id="\x00\x00\x00\x00\x00\x00\x00\x00",
 trace_flags=#<OpenTelemetry::Trace::TraceFlags:0x0000000106a73580 @flags=0>,
 severity_text="INFO",
 severity_number=9,
 body="Instrumentation: OpenTelemetry::Instrumentation::Logger was successfully installed with the following options {}",
 resource=
  #<OpenTelemetry::SDK::Resources::Resource:0x0000000107b9c3c0
   @attributes=
    {"service.name"=>"Logs Demo - OTel Ruby Agent",
     "process.pid"=>91454,
     "process.command"=>"bin/rails",
     "process.runtime.name"=>"ruby",
     "process.runtime.version"=>"3.2.2",
     "process.runtime.description"=>"ruby 3.2.2 (2023-03-30 revision e51014f9c0) [x86_64-darwin22]",
     "telemetry.sdk.name"=>"opentelemetry",
     "telemetry.sdk.language"=>"ruby",
     "telemetry.sdk.version"=>"1.4.1"}>,
 instrumentation_scope=#<struct OpenTelemetry::SDK::InstrumentationScope name="opentelemetry-instrumentation-logger", version="0.0.0">,
 attributes=nil,
 total_recorded_attributes=0>

Contributions

If you have any problems with this example, please feel free to open a PR or an issue in this repository. PRs and comments are also welcome on the experimental PRs mentioned above.

Reviews are also welcome on the PRs related to logs in the opentelemetry-ruby repository. Project status is available here.