Fix UnresolvedValueError in instance statistics

This change fixes the GraphQL::EnumType::UnresolvedValueError error
when the `identifier` field is requested in the instance statistics
graphql endpoint.

app/graphql/types/admin/analytics/instance_statistics/measurement_identifier_enum.rb

@@ -8,16 +8,16 @@ module Types
           graphql_name 'MeasurementIdentifier'
           description 'Possible identifier types for a measurement'
 
-          value 'PROJECTS', 'Project count', value: :projects
-          value 'USERS', 'User count', value: :users
-          value 'ISSUES', 'Issue count', value: :issues
-          value 'MERGE_REQUESTS', 'Merge request count', value: :merge_requests
-          value 'GROUPS', 'Group count', value: :groups
-          value 'PIPELINES', 'Pipeline count', value: :pipelines
-          value 'PIPELINES_SUCCEEDED', 'Pipeline count with success status', value: :pipelines_succeeded
-          value 'PIPELINES_FAILED', 'Pipeline count with failed status', value: :pipelines_failed
-          value 'PIPELINES_CANCELED', 'Pipeline count with canceled status', value: :pipelines_canceled
-          value 'PIPELINES_SKIPPED', 'Pipeline count with skipped status', value: :pipelines_skipped
+          value 'PROJECTS', 'Project count', value: 'projects'
+          value 'USERS', 'User count', value: 'users'
+          value 'ISSUES', 'Issue count', value: 'issues'
+          value 'MERGE_REQUESTS', 'Merge request count', value: 'merge_requests'
+          value 'GROUPS', 'Group count', value: 'groups'
+          value 'PIPELINES', 'Pipeline count', value: 'pipelines'
+          value 'PIPELINES_SUCCEEDED', 'Pipeline count with success status', value: 'pipelines_succeeded'
+          value 'PIPELINES_FAILED', 'Pipeline count with failed status', value: 'pipelines_failed'
+          value 'PIPELINES_CANCELED', 'Pipeline count with canceled status', value: 'pipelines_canceled'
+          value 'PIPELINES_SKIPPED', 'Pipeline count with skipped status', value: 'pipelines_skipped'
         end
       end
     end

changelogs/unreleased/fix-unresolved-value-error-in-instance-statistics-graphql-api.yml

+---
+title: Fix instance statistics GraphQL query with identifier
+merge_request: 44475
+author:
+type: fixed

spec/requests/api/graphql/instance_statistics_measurements_spec.rb

@@ -9,13 +9,16 @@ RSpec.describe 'InstanceStatisticsMeasurements' do
   let!(:instance_statistics_measurement_1) { create(:instance_statistics_measurement, :project_count, recorded_at: 20.days.ago, count: 5) }
   let!(:instance_statistics_measurement_2) { create(:instance_statistics_measurement, :project_count, recorded_at: 10.days.ago, count: 10) }
 
-  let(:query) { graphql_query_for(:instanceStatisticsMeasurements, 'identifier: PROJECTS', 'nodes { count }') }
+  let(:query) { graphql_query_for(:instanceStatisticsMeasurements, 'identifier: PROJECTS', 'nodes { count identifier }') }
 
   before do
     post_graphql(query, current_user: current_user)
   end
 
   it 'returns measurement objects' do
-    expect(graphql_data.dig('instanceStatisticsMeasurements', 'nodes')).to eq([{ "count" => 10 }, { "count" => 5 }])
+    expect(graphql_data.dig('instanceStatisticsMeasurements', 'nodes')).to eq([
+      { "count" => 10, 'identifier' => 'PROJECTS' },
+      { "count" => 5, 'identifier' => 'PROJECTS' }
+    ])
   end
 end