OpenTelemetry ActionPack Instrumentation
The Action Pack instrumentation is a community-maintained instrumentation for the Action Pack portion of the [Ruby on Rails][rails-home] web-application framework.
How do I get started?
Install the gem using:
gem install opentelemetry-instrumentation-action_pack
Or, if you use bundler, include opentelemetry-instrumentation-action_pack
in your Gemfile
.
Usage
To use the instrumentation, call use
with the name of the instrumentation:
OpenTelemetry::SDK.configure do |c|
c.use 'OpenTelemetry::Instrumentation::ActionPack'
end
Alternatively, you can also call use_all
to install all the available instrumentation.
OpenTelemetry::SDK.configure do |c|
c.use_all
end
Active Support Instrumentation
Earlier versions of this instrumentation relied on patching custom dispatch
hooks from Rails's Action Controller to extract request information.
This instrumentation now relies on ActiveSupport::Notifications
and registers a custom Subscriber that listens to relevant events to modify the Rack span.
See the table below for details of what Rails Framework Hook Events are recorded by this instrumentation:
Event Name | Subscribe? | Creates Span? | Notes |
---|---|---|---|
process_action.action_controller |
:white_check_mark: | :x: | It modifies the existing Rack span |
Error Handling for Action Controller
If an error is triggered by Action Controller (such as a 500 internal server error), Action Pack will typically employ the default ActionDispatch::PublicExceptions.new(Rails.public_path)
as the exceptions_app
, as detailed in the documentation.
The error object will be retained within payload[:exception_object]
. Additionally, its storage in request.env['action_dispatch.exception']
is contingent upon the configuration of action_dispatch.show_exceptions
in Rails.
Examples
Example usage can be seen in the ./example/trace_demonstration.rb
file here
How can I get involved?
The opentelemetry-instrumentation-action_pack
gem source is on github, along with related gems including opentelemetry-api
and opentelemetry-sdk
.
The OpenTelemetry Ruby gems are maintained by the OpenTelemetry-Ruby special interest group (SIG). You can get involved by joining us in GitHub Discussions or attending our weekly meeting. See the meeting calendar for dates and times. For more information on this and other language SIGs, see the OpenTelemetry community page.
License
The opentelemetry-instrumentation-action_pack
gem is distributed under the Apache 2.0 license. See LICENSE for more information.