Correct the order of groups and panels

- Order groups by descending order of priority.
- Order panels by descending order of weight.
- Perform sorting after adding project/custom metrics.

lib/gitlab/metrics_dashboard/processor.rb

@@ -3,7 +3,7 @@
 module Gitlab
   module MetricsDashboard
     class Processor
-      STAGES = [CommonMetricsInserter, Sorter, ProjectMetricsInserter].freeze
+      STAGES = [CommonMetricsInserter, ProjectMetricsInserter, Sorter].freeze
 
       def initialize(dashboard, project)
         @dashboard = dashboard.deep_transform_keys(&:to_sym)

lib/gitlab/metrics_dashboard/sorter.rb

@@ -13,13 +13,13 @@ module Gitlab
 
         # Sorts the groups in the dashboard by the :priority key
         def sort_groups!(dashboard)
-          dashboard[:panel_groups] = dashboard[:panel_groups].sort_by { |group| group[:priority] }
+          dashboard[:panel_groups] = dashboard[:panel_groups].sort_by { |group| group[:priority] }.reverse
         end
 
         # Sorts the panels in the dashboard by the :weight key
         def sort_panels!(dashboard)
           dashboard[:panel_groups].each do |group|
-            group[:panels] = group[:panels].sort_by { |panel| panel[:weight] }
+            group[:panels] = group[:panels].sort_by { |panel| panel[:weight] }.reverse
           end
         end
       end

spec/fixtures/lib/gitlab/metrics_dashboard/sample_dashboard.yml

@@ -7,7 +7,7 @@ panel_groups:
   - title: "Super Chart A1"
     type: "area-chart"
     y_label: "y_label"
-    weight: 2
+    weight: 1
     metrics:
     - id: metric_a1
       query_range: 'query'
@@ -16,7 +16,7 @@ panel_groups:
   - title: "Super Chart A2"
     type: "area-chart"
     y_label: "y_label"
-    weight: 1
+    weight: 2
     metrics:
     - id: metric_a2
       query_range: 'query'

spec/lib/gitlab/metrics_dashboard/processor_spec.rb

@@ -18,38 +18,39 @@ describe Gitlab::MetricsDashboard::Processor do
     end
 
     context 'when the project has associated metrics' do
-      let!(:project_metric) { create(:prometheus_metric, project: project) }
+      let!(:project_response_metric) { create(:prometheus_metric, project: project, group: :response) }
+      let!(:project_system_metric) { create(:prometheus_metric, project: project, group: :system) }
+      let!(:project_business_metric) { create(:prometheus_metric, project: project, group: :business) }
 
       it 'includes project-specific metrics' do
-        project_metric_details = {
-          query_range: project_metric.query,
-          unit: project_metric.unit,
-          label: project_metric.legend,
-          metric_id: project_metric.id
-        }
-
-        expect(all_metrics).to include project_metric_details
-      end
-
-      it 'includes project metrics at the end of the config' do
-        expected_metrics_order = ['metric_b', 'metric_a2', 'metric_a1', nil]
-        actual_metrics_order = all_metrics.map { |m| m[:id] }
-
-        expect(actual_metrics_order).to eq expected_metrics_order
-      end
+        expect(all_metrics).to include get_metric_details(project_system_metric)
+        expect(all_metrics).to include get_metric_details(project_response_metric)
+        expect(all_metrics).to include get_metric_details(project_business_metric)
       end
 
       it 'orders groups by priority and panels by weight' do
-      expected_metrics_order = %w(metric_b metric_a2 metric_a1)
-      actual_metrics_order = all_metrics.map { |m| m[:id] }
+        expected_metrics_order = ['metric_a2', 'metric_a1', 'metric_b', project_business_metric.id, project_response_metric.id, project_system_metric.id]
+        actual_metrics_order = all_metrics.map { |m| m[:id] || m[:metric_id] }
 
         expect(actual_metrics_order).to eq expected_metrics_order
       end
     end
+  end
+
+  private
 
   def all_metrics
     dashboard[:panel_groups].map do |group|
       group[:panels].map { |panel| panel[:metrics] }
     end.flatten
   end
+
+  def get_metric_details(metric)
+    {
+      query_range: metric.query,
+      unit: metric.unit,
+      label: metric.legend,
+      metric_id: metric.id
+    }
+  end
 end