Add terraform state metrics to usage data

Relates to https://gitlab.com/gitlab-org/gitlab/-/issues/207510

app/models/terraform/state.rb

@@ -2,6 +2,8 @@
 
 module Terraform
   class State < ApplicationRecord
+    include UsageStatistics
+
     DEFAULT = '{"version":1}'.freeze
     HEX_REGEXP = %r{\A\h+\z}.freeze
     UUID_LENGTH = 32

changelogs/unreleased/mattkasa-207510-terraform-state-usage-ping.yml

+---
+title: Add usage data metrics for terraform states
+merge_request: 31280
+author:
+type: added

lib/gitlab/usage_data.rb

@@ -132,12 +132,14 @@ module Gitlab
             projects_with_alerts_service_enabled: count(AlertsService.active),
             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),
             protected_branches: count(ProtectedBranch),
             releases: count(Release),
             remote_mirrors: count(RemoteMirror),
             snippets: count(Snippet),
             suggestions: count(Suggestion),
             terraform_reports: count(::Ci::JobArtifact.terraform_reports),
+            terraform_states: count(::Terraform::State),
             todos: count(Todo),
             uploads: count(Upload),
             web_hooks: count(WebHook),

spec/factories/usage_data.rb

@@ -36,6 +36,9 @@ FactoryBot.define do
       create(:merge_request, :simple, :with_terraform_reports, source_project: projects[0])
       create(:merge_request, :rebased, :with_terraform_reports, source_project: projects[0])
       create(:merge_request, :simple, :with_terraform_reports, source_project: projects[1])
+      create(:terraform_state, project: projects[0])
+      create(:terraform_state, project: projects[0])
+      create(:terraform_state, project: projects[1])
       create(:zoom_meeting, project: projects[0], issue: projects[0].issues[0], issue_status: :added)
       create_list(:zoom_meeting, 2, project: projects[0], issue: projects[0].issues[1], issue_status: :removed)
       create(:zoom_meeting, project: projects[0], issue: projects[0].issues[2], issue_status: :added)

spec/lib/gitlab/usage_data_spec.rb

@@ -58,7 +58,9 @@ describe Gitlab::UsageData, :aggregate_failures do
         expect(count_data[:projects_with_alerts_service_enabled]).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)
         expect(count_data[:terraform_reports]).to eq(3)
+        expect(count_data[:terraform_states]).to eq(3)
         expect(count_data[:issues_created_from_gitlab_error_tracking_ui]).to eq(1)
         expect(count_data[:issues_with_associated_zoom_link]).to eq(2)
         expect(count_data[:issues_using_zoom_quick_actions]).to eq(3)

spec/support/helpers/usage_data_helpers.rb

@@ -118,6 +118,7 @@ module UsageDataHelpers
       projects_with_expiration_policy_enabled_with_cadence_set_to_1month
       projects_with_expiration_policy_enabled_with_cadence_set_to_3month
       projects_with_terraform_reports
+      projects_with_terraform_states
       pages_domains
       protected_branches
       releases
@@ -125,6 +126,7 @@ module UsageDataHelpers
       snippets
       suggestions
       terraform_reports
+      terraform_states
       todos
       uploads
       web_hooks