Add projects_with_enabled_alert_integrations usage ping

Add `projects_with_enabled_alert_integrations` usage ping
to count projects with at least 1 enabled integration

lib/gitlab/usage_data.rb

@@ -161,6 +161,7 @@ module Gitlab
             projects_with_error_tracking_enabled: count(::ErrorTracking::ProjectErrorTrackingSetting.where(enabled: true)),
             projects_with_alerts_service_enabled: count(AlertsService.active),
             projects_with_alerts_created: distinct_count(::AlertManagement::Alert, :project_id),
+            projects_with_enabled_alert_integrations: distinct_count(::AlertManagement::HttpIntegration.active, :project_id),
             projects_with_prometheus_alerts: distinct_count(PrometheusAlert, :project_id),
             projects_with_terraform_reports: distinct_count(::Ci::JobArtifact.terraform_reports, :project_id),
             projects_with_terraform_states: distinct_count(::Terraform::State, :project_id),

spec/factories/usage_data.rb

@@ -52,6 +52,11 @@ FactoryBot.define do
       create(:protected_branch, project: projects[0])
       create(:protected_branch, name: 'main', project: projects[0])
 
+      # Alert Management
+      create(:alert_management_http_integration, project: projects[0], name: 'DataDog')
+      create(:alert_management_http_integration, project: projects[0], name: 'DataCat')
+      create(:alert_management_http_integration, :inactive, project: projects[1], name: 'DataFox')
+
       # Tracing
       create(:project_tracing_setting, project: projects[0])
 

spec/lib/gitlab/usage_data_spec.rb

@@ -468,6 +468,7 @@ RSpec.describe Gitlab::UsageData, :aggregate_failures do
       expect(count_data[:projects_with_error_tracking_enabled]).to eq(1)
       expect(count_data[:projects_with_tracing_enabled]).to eq(1)
       expect(count_data[:projects_with_alerts_service_enabled]).to eq(1)
+      expect(count_data[:projects_with_enabled_alert_integrations]).to eq(1)
       expect(count_data[:projects_with_prometheus_alerts]).to eq(2)
       expect(count_data[:projects_with_terraform_reports]).to eq(2)
       expect(count_data[:projects_with_terraform_states]).to eq(2)

spec/support/helpers/usage_data_helpers.rb

@@ -98,6 +98,7 @@ module UsageDataHelpers
       projects_with_repositories_enabled
       projects_with_error_tracking_enabled
       projects_with_alerts_service_enabled
+      projects_with_enabled_alert_integrations
       projects_with_prometheus_alerts
       projects_with_tracing_enabled
       projects_with_expiration_policy_enabled