Merge branch 'lm-add-multimetrics-dashboard' into 'master'

Seed metrics dashboard with mulit metric example

See merge request gitlab-org/gitlab!28490

doc/development/rake_tasks.md

@@ -65,6 +65,16 @@ bin/rake "gitlab:seed:group_seed[subgroup_depth, username]"
 
 Group are additionally seeded with epics if GitLab instance has epics feature available.
 
+#### Seeding custom metrics for the monitoring dashboard
+
+A lot of different types of metrics are supported in the monitoring dashboard.
+
+To import these metrics, you can run:
+
+```shell
+bundle exec rake 'gitlab:seed:development_metrics[your_project_id]'
+```
+
 ### Automation
 
 If you're very sure that you want to **wipe the current database** and refill

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

+namespace :gitlab do
+  namespace :seed do
+    desc "GitLab | Metrics | Setup development metrics"
+    task :development_metrics, [:project_id] => :gitlab_environment do |_, args|
+      shared_multi_metrics_attributes = {
+        title: 'Memory multi metric',
+        y_label: 'Memory (GiB)',
+        project_id: args.project_id,
+        unit: 'GiB',
+        group: 'system'
+      }
+      PrometheusMetric.find_or_create_by(
+        **shared_multi_metrics_attributes,
+        identifier: "#{args.project_id}-additional_system_metrics_container_memory_usage",
+        legend: 'Usage (GiB)',
+        query: 'avg(sum(container_memory_usage_bytes{id="/"}) by (job)) without (job) / 2^30'
+      )
+      PrometheusMetric.find_or_create_by(
+        **shared_multi_metrics_attributes,
+        identifier: "#{args.project_id}-additional_system_metrics_kube_node_status_capacity_memory_bytes",
+        query: 'sum(kube_node_status_capacity_memory_bytes{kubernetes_namespace="gitlab-managed-apps"})/2^30',
+        legend: 'Capacity (GiB)'
+      )
+      PrometheusMetric.find_or_create_by(
+        **shared_multi_metrics_attributes,
+        identifier: "#{args.project_id} additional_system_metrics_kube_pod_container_resource_requests_memory_bytes",
+        query: 'sum(kube_pod_container_resource_requests_memory_bytes{kubernetes_namespace="gitlab-managed-apps"})/2^30',
+        legend: 'Requested (GiB)'
+      )
+    end
+  end
+end