Add error tracking usage counts

changelogs/unreleased/ce-56153-error-tracking-counts.yml

+---
+title: Add usage counts for error tracking feature
+merge_request: 25472
+author:
+type: added

lib/gitlab/usage_data.rb

@@ -84,6 +84,7 @@ module Gitlab
             projects: count(Project),
             projects_imported_from_github: count(Project.where(import_type: 'github')),
             projects_with_repositories_enabled: count(ProjectFeature.where('repository_access_level > ?', ProjectFeature::DISABLED)),
+            projects_with_error_tracking_enabled: count(::ErrorTracking::ProjectErrorTrackingSetting.where(enabled: true)),
             protected_branches: count(ProtectedBranch),
             releases: count(Release),
             remote_mirrors: count(RemoteMirror),

spec/lib/gitlab/usage_data_spec.rb

@@ -13,6 +13,8 @@ describe Gitlab::UsageData do
       create(:service, project: projects[0], type: 'SlackSlashCommandsService', active: true)
       create(:service, project: projects[1], type: 'SlackService', active: true)
       create(:service, project: projects[2], type: 'SlackService', active: true)
+      create(:project_error_tracking_setting, project: projects[0])
+      create(:project_error_tracking_setting, project: projects[1], enabled: false)
 
       gcp_cluster = create(:cluster, :provided_by_gcp)
       create(:cluster, :provided_by_user)
@@ -117,6 +119,7 @@ describe Gitlab::UsageData do
         projects_slack_slash_active
         projects_prometheus_active
         projects_with_repositories_enabled
+        projects_with_error_tracking_enabled
         pages_domains
         protected_branches
         releases
@@ -146,6 +149,7 @@ describe Gitlab::UsageData do
       expect(count_data[:projects_slack_notifications_active]).to eq(2)
       expect(count_data[:projects_slack_slash_active]).to eq(1)
       expect(count_data[:projects_with_repositories_enabled]).to eq(2)
+      expect(count_data[:projects_with_error_tracking_enabled]).to eq(1)
 
       expect(count_data[:clusters_enabled]).to eq(7)
       expect(count_data[:project_clusters_enabled]).to eq(6)