Make running jobs metric for queuing a private method

lib/gitlab/ci/queue/metrics.rb

@@ -69,31 +69,6 @@ module Gitlab
           self.class.attempt_counter.increment
         end
 
-        # rubocop: disable CodeReuse/ActiveRecord
-        def jobs_running_for_project(job)
-          return '+Inf' unless runner.instance_type?
-
-          # excluding currently started job
-          running_jobs_count = running_jobs_relation(job)
-            .where(runner: ::Ci::Runner.instance_type)
-            .limit(JOBS_RUNNING_FOR_PROJECT_MAX_BUCKET + 1).count - 1
-
-          if running_jobs_count < JOBS_RUNNING_FOR_PROJECT_MAX_BUCKET
-            running_jobs_count
-          else
-            "#{JOBS_RUNNING_FOR_PROJECT_MAX_BUCKET}+"
-          end
-        end
-        # rubocop: enable CodeReuse/ActiveRecord
-
-        def running_jobs_relation(job)
-          if ::Feature.enabled?(:ci_pending_builds_maintain_denormalized_data, default_enabled: :yaml)
-            ::Ci::RunningBuild.where(project_id: job.project.id)
-          else
-            job.project.builds.running
-          end
-        end
-
         def increment_queue_operation(operation)
           self.class.increment_queue_operation(operation)
         end
@@ -256,6 +231,33 @@ module Gitlab
             Gitlab::Metrics.histogram(name, comment, labels, buckets)
           end
         end
+
+        private
+
+        # rubocop: disable CodeReuse/ActiveRecord
+        def jobs_running_for_project(job)
+          return '+Inf' unless runner.instance_type?
+
+          # excluding currently started job
+          running_jobs_count = running_jobs_relation(job)
+            .where(runner: ::Ci::Runner.instance_type)
+            .limit(JOBS_RUNNING_FOR_PROJECT_MAX_BUCKET + 1).count - 1
+
+          if running_jobs_count < JOBS_RUNNING_FOR_PROJECT_MAX_BUCKET
+            running_jobs_count
+          else
+            "#{JOBS_RUNNING_FOR_PROJECT_MAX_BUCKET}+"
+          end
+        end
+
+        def running_jobs_relation(job)
+          if ::Feature.enabled?(:ci_pending_builds_maintain_denormalized_data, default_enabled: :yaml)
+            ::Ci::RunningBuild.where(project_id: job.project.id)
+          else
+            job.project.builds.running
+          end
+        end
+        # rubocop: enable CodeReuse/ActiveRecord
       end
     end
   end