Change the schema of the common_metrics.yml

- Change it to the new dashboard syntax described here:
https://gitlab.com/gitlab-org/gitlab-ce/issues/60383.

db/importers/common_metrics_importer.rb

@@ -53,7 +53,7 @@ module Importers
     private
 
     def process_content(&blk)
-      content.map do |group|
+      content['panel_groups'].map do |group|
         process_group(group, &blk)
       end
     end
@@ -63,28 +63,28 @@ module Importers
         group: find_group_title_key(group['group'])
       }
 
-      group['metrics'].map do |metric|
-        process_metric(metric, attributes, &blk)
+      group['panels'].map do |panel|
+        process_panel(panel, attributes, &blk)
       end
     end
 
-    def process_metric(metric, attributes, &blk)
+    def process_panel(panel, attributes, &blk)
       attributes = attributes.merge(
-        title: metric['title'],
-        y_label: metric['y_label'])
+        title: panel['title'],
+        y_label: panel['y_label'])
 
-      metric['queries'].map do |query|
-        process_metric_query(query, attributes, &blk)
+      panel['metrics'].map do |metric_details|
+        process_metric_details(metric_details, attributes, &blk)
       end
     end
 
-    def process_metric_query(query, attributes, &blk)
+    def process_metric_details(metric_details, attributes, &blk)
       attributes = attributes.merge(
-        legend: query['label'],
-        query: query['query_range'],
-        unit: query['unit'])
+        legend: metric_details['label'],
+        query: metric_details['query_range'],
+        unit: metric_details['unit'])
 
-      yield(query['id'], attributes)
+      yield(metric_details['id'], attributes)
     end
 
     def find_or_build_metric!(id)

spec/db/importers/common_metrics_importer_spec.rb

@@ -23,10 +23,10 @@ describe Importers::CommonMetricsImporter do
   subject { described_class.new }
 
   context "does import common_metrics.yml" do
-    let(:groups) { subject.content }
-    let(:metrics) { groups.map { |group| group['metrics'] }.flatten }
-    let(:queries) { metrics.map { |group| group['queries'] }.flatten }
-    let(:query_ids) { queries.map { |query| query['id'] } }
+    let(:groups) { subject.content['panel_groups'] }
+    let(:panels) { groups.map { |group| group['panels'] }.flatten }
+    let(:metrics) { panels.map { |group| group['metrics'] }.flatten }
+    let(:metric_ids) { metrics.map { |metric| metric['id'] } }
 
     before do
       subject.execute
@@ -36,20 +36,20 @@ describe Importers::CommonMetricsImporter do
       expect(PrometheusMetric.common.group(:group).count.count).to eq(groups.count)
     end
 
-    it "has the same amount of metrics" do
-      expect(PrometheusMetric.common.group(:group, :title).count.count).to eq(metrics.count)
+    it "has the same amount of panels" do
+      expect(PrometheusMetric.common.group(:group, :title).count.count).to eq(panels.count)
     end
 
-    it "has the same amount of queries" do
-      expect(PrometheusMetric.common.count).to eq(queries.count)
+    it "has the same amount of metrics" do
+      expect(PrometheusMetric.common.count).to eq(metrics.count)
     end
 
     it "does not have duplicate IDs" do
-      expect(query_ids).to eq(query_ids.uniq)
+      expect(metric_ids).to eq(metric_ids.uniq)
     end
 
     it "imports all IDs" do
-      expect(PrometheusMetric.common.pluck(:identifier)).to contain_exactly(*query_ids)
+      expect(PrometheusMetric.common.pluck(:identifier)).to contain_exactly(*metric_ids)
     end
   end
 
@@ -65,24 +65,26 @@ describe Importers::CommonMetricsImporter do
 
   context 'does import properly all fields' do
     let(:query_identifier) { 'response-metric' }
-    let(:group) do
+    let(:dashboard) do
       {
-        group: 'Response metrics (NGINX Ingress)',
-        metrics: [{
-          title: "Throughput",
-          y_label: "Requests / Sec",
-          queries: [{
-            id: query_identifier,
-            query_range: 'my-query',
-            unit: 'my-unit',
-            label: 'status code'
+        panel_groups: [{
+          group: 'Response metrics (NGINX Ingress)',
+          panels: [{
+            title: "Throughput",
+            y_label: "Requests / Sec",
+            metrics: [{
+              id: query_identifier,
+              query_range: 'my-query',
+              unit: 'my-unit',
+              label: 'status code'
+            }]
           }]
         }]
       }
     end
 
     before do
-      expect(subject).to receive(:content) { [group.deep_stringify_keys] }
+      expect(subject).to receive(:content) { dashboard.deep_stringify_keys }
     end
 
     shared_examples 'stores metric' do