Merge branch 'metrics/gb/add-tmp-stage-creation-metrics' into 'master'

Add invalid builds counter metric to stage seeds class

See merge request gitlab-org/gitlab-ce!15764

lib/gitlab/ci/pipeline/chain/create.rb

@@ -17,11 +17,27 @@ module Gitlab
             end
           rescue ActiveRecord::RecordInvalid => e
             error("Failed to persist the pipeline: #{e}")
+          ensure
+            if pipeline.builds.where(stage_id: nil).any?
+              invalid_builds_counter.increment(node: hostname)
+            end
           end
 
           def break?
             !pipeline.persisted?
           end
+
+          private
+
+          def invalid_builds_counter
+            @counter ||= Gitlab::Metrics
+              .counter(:gitlab_ci_invalid_builds_total,
+                       'Invalid builds without stage assigned counter')
+          end
+
+          def hostname
+            @hostname ||= Socket.gethostname
+          end
         end
       end
     end