diff --git a/Gemfile b/Gemfile
index 90db2c43006..e9e5c7df075 100644
--- a/Gemfile
+++ b/Gemfile
@@ -210,6 +210,7 @@ gem 'net-ssh',            '~> 3.0.1'
 
 # Metrics
 group :metrics do
+  gem 'method_source', '~> 0.8', require: false
   gem 'influxdb', '~> 0.2', require: false
   gem 'connection_pool', '~> 2.0', require: false
 end
diff --git a/Gemfile.lock b/Gemfile.lock
index 7d592ba93a7..3f301111224 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -887,6 +887,7 @@ DEPENDENCIES
   kaminari (~> 0.16.3)
   letter_opener (~> 1.1.2)
   mail_room (~> 0.6.1)
+  method_source (~> 0.8)
   minitest (~> 5.7.0)
   mousetrap-rails (~> 1.4.6)
   mysql2 (~> 0.3.16)
diff --git a/config/initializers/metrics.rb b/config/initializers/metrics.rb
index 0ac4299dcba..a47d2bf59a6 100644
--- a/config/initializers/metrics.rb
+++ b/config/initializers/metrics.rb
@@ -2,6 +2,7 @@ if Gitlab::Metrics.enabled?
   require 'influxdb'
   require 'socket'
   require 'connection_pool'
+  require 'method_source'
 
   # These are manually require'd so the classes are registered properly with
   # ActiveSupport.
@@ -18,6 +19,26 @@ if Gitlab::Metrics.enabled?
     end
   end
 
+  # This instruments all methods residing in app/models that (appear to) use any
+  # of the ActiveRecord methods. This has to take place _after_ initializing as
+  # for some unknown reason calling eager_load! earlier breaks Devise.
+  Gitlab::Application.config.after_initialize do
+    Rails.application.eager_load!
+
+    models = Rails.root.join('app', 'models').to_s
+
+    regex = Regexp.union(
+      ActiveRecord::Querying.public_instance_methods(false).map(&:to_s)
+    )
+
+    Gitlab::Metrics::Instrumentation.
+      instrument_class_hierarchy(ActiveRecord::Base) do |_, method|
+        loc = method.source_location
+
+        loc && loc[0].start_with?(models) && method.source =~ regex
+      end
+  end
+
   Gitlab::Metrics::Instrumentation.configure do |config|
     config.instrument_instance_methods(Gitlab::Shell)