Not sure if the directions aren't idiot proof enough but I have the gem running production but I don't see any transactions listed for my rake tasks. To make sure the agent and the gem were running I included the following within my rake tasks.

require 'newrelic-rake'
NewRelic::Agent.manual_start

Running rails 4.0.2

I'm running a separate environment where my rails codebase is being used exclusively for running rake tasks, not serving any requests. I've added newrelic-rake and am successfully able to see my rake tasks under Background Tasks in the New Relic dashboard.

However, if I run a New Relic Thread Profiler during a time when I have these rake tasks running, the result doesn't show any samples at all, particularly none for "background" which is where I would expect these to show up since that's where they show up in New Relic dashboard.

Is there any specific reason why this wouldn't be supported by newrelic-rake? I'm certainly going to investigate further myself but if you have any reason to think this is a bug/misconfiguration or just something that wouldn't work with current newrelic-rake I'd appreciate a pointer. Thanks!

Hey there! We noticed that the tests for your gem are using the StatsEngine#metrics method, which with version 3.11.0 of newrelic_rpm is going away.

Luckily, we've provided a replacement which is what we use internally for validating metric recording called assert_metrics_recorded. You can see more documentation for it at https://docs.newrelic.com/docs/agents/ruby-agent/frameworks/third-party-instrumentation#testing-your-extension.

Let us know if you have any problems with updating to use the new testing methods, and thanks for your work extending the Ruby agent! ✨

cc/ @tkrajcar

Currently when I run any rake task after adding newrelic-rake to my project, I'm seeing something similar to:

$ rake RAILS_ENV=production db:migrate --trace
** Invoke db:migrate (first_time)
** Invoke environment (first_time)
** Execute environment
** Execute db:migrate
** Invoke db:schema:dump (first_time)
** Invoke environment
rake aborted!
Can't add a scope listener midflight in a transaction
// followed by stack trace

I haven't had time yet to look at NewRelic internals so that's about all I can provide. Issue goes away as soon as I remove the gem. Going to jump into code now and see if there's something that can be done on the newrelic-rake end to mitigate this.

First of all, great gem, really useful!

My issue is that the autostart.blacklisted_rake_tasks setting causes newrelic_rpm not to start the Agent for certain rake tasks, which didn't play nicely with newrelic-rake for the "assets:precompile" task.

Full history:

I noticed some warnings after deploying to Heroku:

WARN : Error installing New Relic Browser Monitoring middleware
WARN : RuntimeError: can't modify frozen Array

Did some digging and discovered that it's due to:
config.middleware.use NewRelic::Rack::BrowserMonitoring

(from the newrelic_rpm gem)

Seems to be causing the error because the assets tasks do...

# Override this task change the loaded dependencies
desc "Load asset compile environment"
task :environment do
  # Load full Rails environment by default
  Rake::Task['environment'].invoke
end

(from the sprockets-rails gem)

For now, I've set agent_enabled: true which solves the issue, but ideally I could use the autostart.blacklisted_rake_tasks option (really I would just use the defaults) to avoid starting the Agent for assets tasks, and then the newrelic-rake gem would just "fall in line."

So, I think the main fix is to respect the autostart.blacklisted_rake_tasks setting, which contains "assets:precompile" by default.

Thoughts?

This gem works like a charm for rails projects and rake tasks with the :environment dependency. Other rake tasks don't appear in NR.

I analyzed this a bit and found out :environment tasks are caught because

• people usually do Bundler.require in their application.rb
• the newrelic_rpm gem has a railtie with an initializer starting the agent

These prerequisits amount roughly to this setup:

require 'newrelic-rake'
NewRelic::Agent.manual_start

Placing these lines in the rake file should make things work for all tasks.