Merge pull request #33 from DataDog/add_ruby_profiling

adding continuous profiling

Author: spottsdd

services/backend/Dockerfile

@@ -36,4 +36,4 @@ RUN yarn build
 
 EXPOSE 4000
 
-CMD ["/bin/bash", "-c", "bundle exec rails s -b 0.0.0.0 -p 4000"]
+CMD ["/bin/bash", "-c", "bundle exec ddtracerb exec rails s -b 0.0.0.0 -p 4000"]

services/backend/Gemfile

@@ -98,4 +98,7 @@ gem 'sassc', github: 'sass/sassc-ruby', group: :development
 
 # monitoring
 gem 'ddtrace', require: 'ddtrace/auto_instrument'
-gem 'dogstatsd-ruby', require: 'datadog/statsd'
+# needed for Datadog Continuous Profiler
+gem 'google-protobuf', '~> 3.0'
+# needed for runtime metrics
+gem 'dogstatsd-ruby', require: 'datadog/statsd'

services/backend/config/initializers/datadog-tracer.rb

@@ -2,4 +2,5 @@
   c.env = ENV['DD_ENV'] || 'development'
   c.service = ENV['DD_SERVICE'] || 'store-backend'
   c.tracing.sampling.default_rate = 1.0
+  c.profiling.enabled = true
 end