Tag all transaction metrics with an "action" tag

Without this it's impossible to find out what methods/views/queries are
executed by a certain controller or Sidekiq worker. While this will
increase the total number of series it should stay within reasonable
limits due to the amount of "actions" being small enough.

3 files changed, 23 insertions, 13 deletions

diff --git a/spec/lib/gitlab/metrics/rack_middleware_spec.rb b/spec/lib/gitlab/metrics/rack_middleware_spec.rb
index 4e6dfc73df2..b99be4e1060 100644
--- a/spec/lib/gitlab/metrics/rack_middleware_spec.rb
+++ b/spec/lib/gitlab/metrics/rack_middleware_spec.rb
@@ -57,7 +57,7 @@ describe Gitlab::Metrics::RackMiddleware do
 
       middleware.tag_controller(transaction, env)
 
-      expect(transaction.tags[:action]).to eq('TestController#show')
+      expect(transaction.action).to eq('TestController#show')
     end
   end
 end
diff --git a/spec/lib/gitlab/metrics/sidekiq_middleware_spec.rb b/spec/lib/gitlab/metrics/sidekiq_middleware_spec.rb
index 5882e7d81c7..e520a968999 100644
--- a/spec/lib/gitlab/metrics/sidekiq_middleware_spec.rb
+++ b/spec/lib/gitlab/metrics/sidekiq_middleware_spec.rb
@@ -5,22 +5,15 @@ describe Gitlab::Metrics::SidekiqMiddleware do
 
   describe '#call' do
     it 'tracks the transaction' do
-      worker = Class.new.new
+      worker = double(:worker, class: double(:class, name: 'TestWorker'))
+
+      expect(Gitlab::Metrics::Transaction).to receive(:new).
+        with('TestWorker#perform').
+        and_call_original
 
       expect_any_instance_of(Gitlab::Metrics::Transaction).to receive(:finish)
 
       middleware.call(worker, 'test', :test) { nil }
     end
   end
-
-  describe '#tag_worker' do
-    it 'adds the worker class and action to the transaction' do
-      trans  = Gitlab::Metrics::Transaction.new
-      worker = double(:worker, class: double(:class, name: 'TestWorker'))
-
-      expect(trans).to receive(:add_tag).with(:action, 'TestWorker#perform')
-
-      middleware.tag_worker(trans, worker)
-    end
-  end
 end
diff --git a/spec/lib/gitlab/metrics/transaction_spec.rb b/spec/lib/gitlab/metrics/transaction_spec.rb
index 3a27f897735..6bdeb719491 100644
--- a/spec/lib/gitlab/metrics/transaction_spec.rb
+++ b/spec/lib/gitlab/metrics/transaction_spec.rb
@@ -96,5 +96,22 @@ describe Gitlab::Metrics::Transaction do
 
       transaction.submit
     end
+
+    it 'adds the action as a tag for every metric' do
+      transaction.action = 'Foo#bar'
+      transaction.track_self
+
+      hash = {
+        series:    'rails_transactions',
+        tags:      { action: 'Foo#bar' },
+        values:    { duration: 0.0 },
+        timestamp: an_instance_of(Fixnum)
+      }
+
+      expect(Gitlab::Metrics).to receive(:submit_metrics).
+        with([hash])
+
+      transaction.submit
+    end
   end
 end