Add license ID number to usage ping

This can be used for more accurate matching than the MD5.

ee/app/models/license.rb

@@ -264,6 +264,10 @@ class License < ActiveRecord::Base
     features.include?(feature)
   end
 
+  def license_id
+    restricted_attr(:id)
+  end
+
   def restricted_user_count
     restricted_attr(:active_user_count)
   end

ee/changelogs/unreleased/add-license-id-to-usage-ping.yml

+---
+title: Add license ID number to usage ping
+merge_request:
+author:
+type: changed

lib/gitlab/usage_data.rb

@@ -32,6 +32,7 @@ module Gitlab
 
         if license
           usage_data[:license_md5] = license.md5
+          usage_data[:license_id] = license.license_id
           usage_data[:historical_max_users] = ::HistoricalData.max_historical_user_count
           usage_data[:licensee] = license.licensee
           usage_data[:license_user_count] = license.restricted_user_count

spec/lib/gitlab/usage_data_spec.rb

@@ -30,6 +30,7 @@ describe Gitlab::UsageData do
         license_trial
         licensee
         license_md5
+        license_id
         recorded_at
         mattermost_enabled
         edition
@@ -160,6 +161,7 @@ describe Gitlab::UsageData do
 
       expect(subject[:uuid]).to eq(Gitlab::CurrentSettings.uuid)
       expect(subject[:license_md5]).to eq(Digest::MD5.hexdigest(license.data))
+      expect(subject[:license_id]).to eq(license.license_id)
       expect(subject[:version]).to eq(Gitlab::VERSION)
       expect(subject[:licensee]).to eq(license.licensee)
       expect(subject[:active_user_count]).to eq(User.active.count)