Add application settings to support inactive project deletion feature

To support the inactive project deletion feature we need to store the
following settings for the GitLab instance.
- Enable/disable inactive project deletion.
- Minimum size of the repository in MB that should be considered
for inactive project deletion.
- Time in months after which we need to send a warning email to the
project maintainers saying that their project will be deleted
because of inactivity.
- Time in months after which the project needs to be deleted
because of inactivity.

Changelog: added

app/helpers/application_settings_helper.rb

@@ -223,6 +223,7 @@ module ApplicationSettingsHelper
       :default_project_visibility,
       :default_projects_limit,
       :default_snippet_visibility,
+      :delete_inactive_projects,
       :disable_feed_token,
       :disabled_oauth_sign_in_sources,
       :domain_denylist,
@@ -273,6 +274,9 @@ module ApplicationSettingsHelper
       :html_emails_enabled,
       :import_sources,
       :in_product_marketing_emails_enabled,
+      :inactive_projects_delete_after,
+      :inactive_projects_min_size_mb,
+      :inactive_projects_send_warning_email_after,
       :invisible_captcha_enabled,
       :max_artifacts_size,
       :max_attachment_size,

app/models/application_setting.rb

@@ -578,6 +578,15 @@ class ApplicationSetting < ApplicationRecord
 
   validates :public_runner_releases_url, addressable_url: true, presence: true
 
+  validates :inactive_projects_min_size_mb,
+            numericality: { only_integer: true, greater_than_or_equal_to: 0 }
+
+  validates :inactive_projects_delete_after,
+            numericality: { only_integer: true, greater_than: 0 }
+
+  validates :inactive_projects_send_warning_email_after,
+            numericality: { only_integer: true, greater_than: 0, less_than: :inactive_projects_delete_after }
+
   attr_encrypted :asset_proxy_secret_key,
                  mode: :per_attribute_iv,
                  key: Settings.attr_encrypted_db_key_base_truncated,

db/migrate/20220406113217_add_inactive_project_deletion_to_application_settings.rb

+# frozen_string_literal: true
+
+class AddInactiveProjectDeletionToApplicationSettings < Gitlab::Database::Migration[1.0]
+  def change
+    add_column :application_settings, :delete_inactive_projects, :boolean, default: false, null: false
+    add_column :application_settings, :inactive_projects_delete_after, :integer, default: 2, null: false
+    add_column :application_settings, :inactive_projects_min_size_mb, :integer, default: 0, null: false
+    add_column :application_settings, :inactive_projects_send_warning_email_after, :integer, default: 1, null: false
+  end
+end

db/schema_migrations/20220406113217

+161ba8db7400c12dc0550246af8db86487e811803eaecedcb2761f4a8349920b
\ No newline at end of file

db/structure.sql

@@ -11257,6 +11257,10 @@ CREATE TABLE application_settings (
     database_grafana_api_url text,
     database_grafana_tag text,
     public_runner_releases_url text DEFAULT 'https://gitlab.com/api/v4/projects/gitlab-org%2Fgitlab-runner/releases'::text NOT NULL,
+    delete_inactive_projects boolean DEFAULT false NOT NULL,
+    inactive_projects_delete_after integer DEFAULT 2 NOT NULL,
+    inactive_projects_min_size_mb integer DEFAULT 0 NOT NULL,
+    inactive_projects_send_warning_email_after integer DEFAULT 1 NOT NULL,
     CONSTRAINT app_settings_container_reg_cleanup_tags_max_list_size_positive CHECK ((container_registry_cleanup_tags_service_max_list_size >= 0)),
     CONSTRAINT app_settings_dep_proxy_ttl_policies_worker_capacity_positive CHECK ((dependency_proxy_ttl_group_policy_worker_capacity >= 0)),
     CONSTRAINT app_settings_ext_pipeline_validation_service_url_text_limit CHECK ((char_length(external_pipeline_validation_service_url) <= 255)),

doc/api/settings.md

@@ -274,6 +274,7 @@ listed in the descriptions of the relevant settings.
 | `default_projects_limit`                 | integer          | no                                   | Project limit per user. Default is `100000`. |
 | `default_snippet_visibility`             | string           | no                                   | What visibility level new snippets receive. Can take `private`, `internal` and `public` as a parameter. Default is `private`. |
 | `delayed_project_deletion` **(PREMIUM SELF)** | boolean     | no                                   | Enable delayed project deletion by default in new groups. Default is `false`. |
+| `delete_inactive_projects`               | boolean          | no                                   | Enable inactive project deletion feature. Default is `false`. |
 | `deletion_adjourned_period` **(PREMIUM SELF)** | integer    | no                                   | The number of days to wait before deleting a project or group that is marked for deletion. Value must be between 0 and 90.
 | `diff_max_patch_bytes`                   | integer          | no                                   | Maximum [diff patch size](../user/admin_area/diff_limits.md), in bytes. |
 | `diff_max_files`                         | integer          | no                                   | Maximum [files in a diff](../user/admin_area/diff_limits.md). |
@@ -350,6 +351,9 @@ listed in the descriptions of the relevant settings.
 | `html_emails_enabled`                    | boolean          | no                                   | Enable HTML emails. |
 | `import_sources`                         | array of strings | no                                   | Sources to allow project import from, possible values: `github`, `bitbucket`, `bitbucket_server`, `gitlab`, `fogbugz`, `git`, `gitlab_project`, `gitea`, `manifest`, and `phabricator`. |
 | `in_product_marketing_emails_enabled`    | boolean          | no                                   | Enable [in-product marketing emails](../user/profile/notifications.md#global-notification-settings). Enabled by default. |
+| `inactive_projects_delete_after`         | integer          | no                                   | Delete projects that are inactive for this time in months. |
+| `inactive_projects_min_size_mb`          | integer          | no                                   | Delete inactive projects that exceed this size in MB. |
+| `inactive_projects_send_warning_email_after` | integer      | no                                   | Send email to maintainers after project is inactive for this time in months. |
 | `invisible_captcha_enabled`              | boolean          | no                                   | Enable Invisible CAPTCHA spam detection during sign-up. Disabled by default. |
 | `issues_create_limit`                    | integer          | no                                   | Max number of issue creation requests per minute per user. Disabled by default.|
 | `keep_latest_artifact`                   | boolean          | no                                   | Prevent the deletion of the artifacts from the most recent successful jobs, regardless of the expiry time. Enabled by default. |

spec/models/application_setting_spec.rb

@@ -1322,4 +1322,19 @@ RSpec.describe ApplicationSetting do
       end
     end
   end
+
+  context "inactive project deletion" do
+    it "validates that inactive_projects_send_warning_email_after is less than inactive_projects_delete_after" do
+      subject[:inactive_projects_delete_after] = 3
+      subject[:inactive_projects_send_warning_email_after] = 6
+
+      expect(subject).to be_invalid
+    end
+
+    it { is_expected.to validate_numericality_of(:inactive_projects_send_warning_email_after).is_greater_than(0) }
+
+    it { is_expected.to validate_numericality_of(:inactive_projects_delete_after).is_greater_than(0) }
+
+    it { is_expected.to validate_numericality_of(:inactive_projects_min_size_mb).is_greater_than_or_equal_to(0) }
+  end
 end