Add shared_runners_duration field to NamespaceMonthlyUsageType

Changelog: changed

doc/api/graphql/reference/index.md

@@ -8704,6 +8704,7 @@ Represents the total number of issues and their weights for a particular day.
 | <a id="ciminutesnamespacemonthlyusageminutes"></a>`minutes` | [`Int`](#int) | Total number of minutes used by all projects in the namespace. |
 | <a id="ciminutesnamespacemonthlyusagemonth"></a>`month` | [`String`](#string) | Month related to the usage data. |
 | <a id="ciminutesnamespacemonthlyusageprojects"></a>`projects` | [`CiMinutesProjectMonthlyUsageConnection`](#ciminutesprojectmonthlyusageconnection) | CI minutes usage data for projects in the namespace. (see [Connections](#connections)) |
+| <a id="ciminutesnamespacemonthlyusagesharedrunnersduration"></a>`sharedRunnersDuration` | [`Int`](#int) | Total numbers of minutes used by the shared runners in the namespace. |
 
 ### `CiMinutesProjectMonthlyUsage`
 

ee/app/graphql/types/ci/minutes/namespace_monthly_usage_type.rb

@@ -18,6 +18,9 @@ module Types
         field :projects, ::Types::Ci::Minutes::ProjectMonthlyUsageType.connection_type, null: true,
               description: 'CI minutes usage data for projects in the namespace.'
 
+        field :shared_runners_duration, ::GraphQL::INT_TYPE, null: true,
+              description: 'Total numbers of minutes used by the shared runners in the namespace.'
+
         def month
           object.date.strftime('%B')
         end

ee/spec/graphql/types/ci/minutes/namespace_monthly_usage_type_spec.rb

@@ -4,6 +4,6 @@ require 'spec_helper'
 
 RSpec.describe GitlabSchema.types['CiMinutesNamespaceMonthlyUsage'] do
   it do
-    expect(described_class).to have_graphql_fields(:minutes, :month, :projects)
+    expect(described_class).to have_graphql_fields(:minutes, :month, :projects, :shared_runners_duration)
   end
 end