You are using a Ruby gem that is incompatible with the New Relic Ruby agent.
While New Relic strives to be compatible with all gems, there are some that will not work properly with the Ruby agent. This details incompatible gems and known workarounds.
Problem: The db-charmer gem has incompatibilities in how it patches Rails controllers.
Solution: Force New Relic to load and start before
DbCharmer.enable_controller_magic!is called. For example, add the following to your config/application.rb:
require 'newrelic_rpm' NewRelic::Agent.manual_start DbCharmer.enable_controller_magic!
Problem: Use The escape_utils gem is incompatible with automatic instrumentation for New Relic's page load timing feature (sometimes referred to as real user monitoring or RUM). Due to the way escape_utils monkey-patches Rack, your whole HTML response may be escaped.
Solution: If you see HTML source instead of the rendered page, use either of these options:
- Remove the escape_utils gems.
- Use manual instrumentation for page load timing.
Problem: If the right_http_connection gem is loaded after
newrelic_rpm, it patches
Net::HTTPclass in a way that causes New Relic's Externals instrumentation to be missed.
Solution: Ensure that
right_http_connectionis required before
Problem: The ar-octopus gem changes the way that ActiveRecord's connection management works, breaking the Ruby agent's ability to capture explain plans for long-running database queries.
Solution: No known workaround - either remove the ar-octopus gem, or continue to use it, in which case no explain plans will be captured.