Adds more identifiers to Seat Link

Adds more identifiers to Seat Link data (hostname, instance_id,
license_md5).

Changelog: changed
EE: true

doc/subscriptions/self_managed/index.md

@@ -209,9 +209,14 @@ Seat Link daily sends a count of all users in connected GitLab self-managed inst
 Seat Link provides **only** the following information to GitLab:
 
 - Date
+- Timestamp
 - License key
 - Historical maximum user count
 - Billable users count
+- GitLab version
+- Hostname
+- Instance ID
+- MD5 hash of license
 
 For offline or closed network customers, the existing [true-up model](#users-over-license) is used. Prorated charges are not possible without user count data.
 
@@ -220,6 +225,8 @@ For offline or closed network customers, the existing [true-up model](#users-ove
 
 <pre><code>
 {
+  gitlab_version: '13.12.0',
+  timestamp: '2020-01-29T18:25:57+00:00',
   date: '2020-01-29',
   license_key: 'ZXlKa1lYUmhJam9pWm5WNmVsTjVZekZ2YTJoV2NucDBh
 RXRxTTA5amQxcG1VMVZqDQpXR3RwZEc5SGIyMVhibmxuZDJ0NWFrNXJTVzVH
@@ -255,8 +262,9 @@ TjJ4eVlVUkdkWEJtDQpkSHByYWpreVJrcG9UVlo0Y0hKSU9URndiV2RzVFdO
 VlhHNXRhVmszTkV0SVEzcEpNMWRyZEVoRU4ydHINCmRIRnFRVTlCVUVVM1pV
 SlRORE4xUjFaYVJGb3JlWGM5UFZ4dUlpd2lhWFlpt2lKV00yRnNVbk5RTjJk
 Sg0KU1hNMGExaE9SVGR2V2pKQlBUMWNiaUo5DQo=',
-  max_historical_user_count: 10,
-  billable_users_count: 6
+  hostname: 'gitlab.example.com',
+  instance_id: 'c1ac02cb-cb3f-4120-b7fe-961bbfa3abb7',
+  license_md5: '7cd897fffb3517dddf01b79a0889b515'
 }
 </code></pre>
 

ee/app/models/gitlab/seat_link_data.rb

@@ -54,7 +54,10 @@ module Gitlab
         date: timestamp.to_date.to_s,
         license_key: key,
         max_historical_user_count: max_users,
-        billable_users_count: billable_users_count
+        billable_users_count: billable_users_count,
+        hostname: Gitlab.config.gitlab.host,
+        instance_id: Gitlab::CurrentSettings.uuid,
+        license_md5: license&.md5
       }
     end
 

ee/spec/models/gitlab/seat_link_data_spec.rb

@@ -76,6 +76,12 @@ RSpec.describe Gitlab::SeatLinkData do
   end
 
   describe '.to_json' do
+    let(:instance_id) { '123' }
+
+    before do
+      stub_application_setting(uuid: instance_id)
+    end
+
     it { is_expected.to delegate_method(:to_json).to(:data) }
 
     it 'returns payload data as a JSON string' do
@@ -86,10 +92,33 @@ RSpec.describe Gitlab::SeatLinkData do
           date: timestamp.to_date.iso8601,
           license_key: key,
           max_historical_user_count: max_users,
-          billable_users_count: billable_users_count
+          billable_users_count: billable_users_count,
+          hostname: Gitlab.config.gitlab.host,
+          instance_id: instance_id,
+          license_md5: ::License.current.md5
         }.to_json
       )
     end
+
+    context 'when instance has no current license' do
+      it 'returns payload data as a JSON string' do
+        allow(License).to receive(:current).and_return(nil)
+
+        expect(subject.to_json).to eq(
+          {
+            gitlab_version: Gitlab::VERSION,
+            timestamp: timestamp.iso8601,
+            date: timestamp.to_date.iso8601,
+            license_key: key,
+            max_historical_user_count: max_users,
+            billable_users_count: billable_users_count,
+            hostname: Gitlab.config.gitlab.host,
+            instance_id: instance_id,
+            license_md5: nil
+          }.to_json
+        )
+      end
+    end
   end
 
   describe '#sync' do

ee/spec/workers/sync_seat_link_request_worker_spec.rb

@@ -23,7 +23,10 @@ RSpec.describe SyncSeatLinkRequestWorker, type: :worker do
           date: '2019-12-31',
           license_key: '123',
           max_historical_user_count: 5,
-          billable_users_count: 4
+          billable_users_count: 4,
+          hostname: Gitlab.config.gitlab.host,
+          instance_id: Gitlab::CurrentSettings.uuid,
+          license_md5: ::License.current.md5
         }.to_json
       )
     end
@@ -117,7 +120,10 @@ RSpec.describe SyncSeatLinkRequestWorker, type: :worker do
             date: '2020-01-01',
             license_key: '123',
             max_historical_user_count: 5,
-            billable_users_count: 4
+            billable_users_count: 4,
+            hostname: Gitlab.config.gitlab.host,
+            instance_id: Gitlab::CurrentSettings.uuid,
+            license_md5: ::License.current.md5
           }.to_json
         )
       end