Merge branch 'lm-rake-task-metrics' into 'master'

Create rake task that adds custom dashboard to ops and seeds an anomaly metric

See merge request gitlab-org/gitlab!29821

ee/lib/tasks/gitlab/seed/metrics.rake

@@ -27,6 +27,26 @@ namespace :gitlab do
         query: 'sum(kube_pod_container_resource_requests_memory_bytes{kubernetes_namespace="gitlab-managed-apps"})/2^30',
         legend: 'Requested (GiB)'
       )
+
+      project = Project.find(args.project_id)
+      content = File.read(Rails.root.join('spec', 'fixtures', 'lib', 'gitlab', 'metrics', 'dashboard', 'development_metrics.yml'))
+      file_attributes = [
+          project.creator,
+          '.gitlab/dashboards/development_metrics.yml',
+          content,
+          {
+            message: 'Seeded development metrics',
+            branch_name: 'master'
+          }
+      ]
+
+      begin
+        project.repository.create_file(*file_attributes)
+      rescue Gitlab::Git::Index::IndexError => error
+        raise error unless error.message == 'A file with this name already exists'
+
+        project.repository.update_file(*file_attributes)
+      end
     end
   end
 end

spec/fixtures/lib/gitlab/metrics/dashboard/development_metrics.yml

+panel_groups:
+  - group: 'Usage Variation'
+    panels:
+      - type: anomaly-chart
+        title: "Memory Usage Rate Anomalies"
+        y_label: "Memory Usage Rate"
+        metrics:
+          - id: container_memory_usage_bytes
+            query_range: avg(sum(rate(container_memory_usage_bytes[15m]))) /1024
+            label: "Memory Usage Rate"
+            unit: "kB"
+          - id: container_memory_usage_bytes_upper
+            query_range: 80000
+            label: "Memory Usage Rate Lower Limit"
+            unit: "kB"
+          - id: container_memory_usage_bytes_lower
+            query_range: 50000
+            label: "Memory Usage Rate Upper Limit"
+            unit: "kB"
+