Wrap newrelic calls in a rescue block

lib/helpers.rb

-require 'new_relic/agent/method_tracer'
 
 helpers do
   def commentable
@@ -375,11 +374,15 @@ helpers do
     end
   end
 
-  include ::NewRelic::Agent::MethodTracer
-  add_method_tracer :user
-  add_method_tracer :thread
-  add_method_tracer :comment
-  add_method_tracer :flag_as_abuse
-  add_method_tracer :un_flag_as_abuse
-  add_method_tracer :handle_threads_query
+  begin
+    require 'new_relic/agent/method_tracer'
+    include ::NewRelic::Agent::MethodTracer
+    add_method_tracer :user
+    add_method_tracer :thread
+    add_method_tracer :comment
+    add_method_tracer :flag_as_abuse
+    add_method_tracer :un_flag_as_abuse
+    add_method_tracer :handle_threads_query
+  rescue LoadError
+  end
 end

models/comment.rb

-require 'new_relic/agent/method_tracer'
 require_relative 'concerns/searchable'
 require_relative 'content'
 require_relative 'constants'
@@ -166,6 +165,10 @@ class Comment < Content
     end
   end
 
-  include ::NewRelic::Agent::MethodTracer
-  add_method_tracer :to_hash
+  begin
+    require 'new_relic/agent/method_tracer'
+    include ::NewRelic::Agent::MethodTracer
+    add_method_tracer :to_hash
+  rescue LoadError
+  end
 end

models/comment_thread.rb

-require 'new_relic/agent/method_tracer'
 require_relative 'concerns/searchable'
 require_relative 'content'
 require_relative 'constants'
@@ -158,6 +157,10 @@ class CommentThread < Content
     subscriptions.delete_all
   end
 
-  include ::NewRelic::Agent::MethodTracer
-  add_method_tracer :to_hash
+  begin
+    require 'new_relic/agent/method_tracer'
+    include ::NewRelic::Agent::MethodTracer
+    add_method_tracer :to_hash
+  rescue LoadError
+  end
 end

models/user.rb

-require 'new_relic/agent/method_tracer'
 require_relative 'constants'
 
 class User
@@ -142,13 +141,17 @@ class User
     read_state.save
   end
 
-  include ::NewRelic::Agent::MethodTracer
-  add_method_tracer :to_hash
-  add_method_tracer :subscribed_thread_ids
-  add_method_tracer :upvoted_ids
-  add_method_tracer :downvoted_ids
-  add_method_tracer :subscribe
-  add_method_tracer :mark_as_read
+  begin
+    require 'new_relic/agent/method_tracer'
+    include ::NewRelic::Agent::MethodTracer
+    add_method_tracer :to_hash
+    add_method_tracer :subscribed_thread_ids
+    add_method_tracer :upvoted_ids
+    add_method_tracer :downvoted_ids
+    add_method_tracer :subscribe
+    add_method_tracer :mark_as_read
+  rescue LoadError
+  end
 
 end
 

presenters/thread.rb

 require_relative 'thread_utils'
-require 'new_relic/agent/method_tracer'
 
 class ThreadPresenter
 
@@ -120,8 +119,12 @@ class ThreadPresenter
     top_level
   end
 
-  include ::NewRelic::Agent::MethodTracer
-  add_method_tracer :to_hash
-  add_method_tracer :merge_response_content
+  begin
+    require 'new_relic/agent/method_tracer'
+    include ::NewRelic::Agent::MethodTracer
+    add_method_tracer :to_hash
+    add_method_tracer :merge_response_content
+  rescue LoadError
+  end
 
 end

presenters/thread_utils.rb

-require 'new_relic/agent/method_tracer'
-
 module ThreadUtils
 
   def self.get_endorsed(threads)
@@ -42,9 +40,13 @@ module ThreadUtils
   end
 
   class << self
-    include ::NewRelic::Agent::MethodTracer
-    add_method_tracer :get_read_states
-    add_method_tracer :get_endorsed
+    begin
+      require 'new_relic/agent/method_tracer'
+      include ::NewRelic::Agent::MethodTracer
+      add_method_tracer :get_read_states
+      add_method_tracer :get_endorsed
+    rescue LoadError
+    end
   end
 
 end