Ensure default metrics embed is cached

app/services/metrics/dashboard/default_embed_service.rb

@@ -23,7 +23,7 @@ module Metrics
       # Returns a new dashboard with only the matching
       # metrics from the system dashboard, stripped of groups.
       # @return [Hash]
-      def raw_dashboard
+      def get_raw_dashboard
         panels = panel_groups.each_with_object([]) do |group, panels|
           matched_panels = group['panels'].select { |panel| matching_panel?(panel) }

spec/services/metrics/dashboard/default_embed_service_spec.rb

@@ -14,14 +14,16 @@ describe Metrics::Dashboard::DefaultEmbedService, :use_clean_rails_memory_store_
   end
   describe '#get_dashboard' do
-    let(:service_params) { [project, user, { environment: environment, dashboard_path: nil }] }
+    let(:service_params) { [project, user, { environment: environment }] }
     let(:service_call) { described_class.new(*service_params).get_dashboard }
     it_behaves_like 'valid embedded dashboard service response'
     it_behaves_like 'raises error for users with insufficient permissions'
     it 'caches the unprocessed dashboard for subsequent calls' do
-      expect(YAML).to receive(:safe_load).once.and_call_original
+      system_service = Metrics::Dashboard::SystemDashboardService
+
+      expect(system_service).to receive(:new).once.and_call_original
       described_class.new(*service_params).get_dashboard
       described_class.new(*service_params).get_dashboard