Track location information as tags

This allows the information to be displayed when using certain functions
(e.g. top()) as well as making it easier to aggregate on a per file
basis.

lib/gitlab/metrics/subscribers/action_view.rb

@@ -16,10 +16,10 @@ module Gitlab
         private
 
         def track(event)
-          path   = relative_path(event.payload[:identifier])
           values = values_for(event)
+          tags   = tags_for(event)
 
-          current_transaction.add_metric(SERIES, values, path: path)
+          current_transaction.add_metric(SERIES, values, tags)
         end
 
         def relative_path(path)
@@ -27,16 +27,21 @@ module Gitlab
         end
 
         def values_for(event)
-          values = { duration: event.duration }
+          { duration: event.duration }
+        end
+
+        def tags_for(event)
+          path = relative_path(event.payload[:identifier])
+          tags = { view: path }
 
           file, line = Metrics.last_relative_application_frame
 
           if file and line
-            values[:file] = file
-            values[:line] = line
+            tags[:file] = file
+            tags[:line] = line
           end
 
-          values
+          tags
         end
 
         def current_transaction

lib/gitlab/metrics/subscribers/active_record.rb

@@ -13,25 +13,30 @@ module Gitlab
         def sql(event)
           return unless current_transaction
 
-          sql    = ObfuscatedSQL.new(event.payload[:sql]).to_s
           values = values_for(event)
+          tags   = tags_for(event)
 
-          current_transaction.add_metric(SERIES, values, sql: sql)
+          current_transaction.add_metric(SERIES, values, tags)
         end
 
         private
 
         def values_for(event)
-          values = { duration: event.duration }
+          { duration: event.duration }
+        end
+
+        def tags_for(event)
+          sql  = ObfuscatedSQL.new(event.payload[:sql]).to_s
+          tags = { sql: sql }
 
           file, line = Metrics.last_relative_application_frame
 
           if file and line
-            values[:file] = file
-            values[:line] = line
+            tags[:file] = file
+            tags[:line] = line
           end
 
-          values
+          tags
         end
 
         def current_transaction

spec/lib/gitlab/metrics/subscribers/action_view_spec.rb

@@ -21,10 +21,15 @@ describe Gitlab::Metrics::Subscribers::ActionView do
 
   describe '#render_template' do
     it 'tracks rendering of a template' do
-      values = { duration: 2.1, file: 'app/views/x.html.haml', line: 4 }
+      values = { duration: 2.1 }
+      tags   = {
+        view: 'app/views/x.html.haml',
+        file: 'app/views/x.html.haml',
+        line: 4
+      }
 
       expect(transaction).to receive(:add_metric).
-        with(described_class::SERIES, values, path: 'app/views/x.html.haml')
+        with(described_class::SERIES, values, tags)
 
       subscriber.render_template(event)
     end

spec/lib/gitlab/metrics/subscribers/active_record_spec.rb

@@ -19,11 +19,12 @@ describe Gitlab::Metrics::Subscribers::ActiveRecord do
 
   describe '#sql' do
     it 'tracks the execution of a SQL query' do
-      values = { duration: 0.2, file: 'app/models/foo.rb', line: 4 }
       sql    = 'SELECT * FROM users WHERE id = ?'
+      values = { duration: 0.2 }
+      tags   = { sql: sql, file: 'app/models/foo.rb', line: 4 }
 
       expect(transaction).to receive(:add_metric).
-        with(described_class::SERIES, values, sql: sql)
+        with(described_class::SERIES, values, tags)
 
       subscriber.sql(event)
     end