clean install

web/core/modules/update/config/schema/update.schema.yml

@@ -0,0 +1,58 @@
+# Schema for the configuration files of the Update module.
+
+update.settings:
+  type: config_object
+  label: 'Update settings'
+  constraints:
+    FullyValidatable: ~
+  mapping:
+    check:
+      type: mapping
+      label: 'Check settings'
+      mapping:
+        disabled_extensions:
+          type: boolean
+          label: 'Check for updates of uninstalled modules and themes'
+        interval_days:
+          type: integer
+          label: 'Days since last check'
+          constraints:
+            # @see \Drupal\update\UpdateSettingsForm::buildForm()
+            # The options are daily and weekly.
+            Choice: [1, 7]
+    fetch:
+      type: mapping
+      label: 'Fetch settings'
+      mapping:
+        url:
+          type: uri
+          nullable: true
+          label: 'URL for fetching available update data'
+        max_attempts:
+          type: integer
+          label: 'Maximum attempts'
+          constraints:
+            Range:
+              min: 1
+        timeout:
+          type: integer
+          label: 'Timeout in seconds'
+          constraints:
+            Range:
+              min: 1
+    notification:
+      type: mapping
+      label: 'Notification settings'
+      mapping:
+        emails:
+          type: sequence
+          label: 'Email addresses to notify when updates are available'
+          sequence:
+            type: email
+            label: 'Email'
+        threshold:
+          type: string
+          label: 'Email notification threshold'
+          constraints:
+            # @see \Drupal\update\UpdateSettingsForm::buildForm()
+            Choice: [all, security]

web/core/modules/update/config/schema/update.source.schema.yml

@@ -0,0 +1,12 @@
+# Schema for the migration source plugins.
+
+migrate.source.update_settings:
+  type: migrate_source_sql
+  label: 'Drupal update settings'
+  mapping:
+    variables:
+      type: sequence
+      label: 'Variables'
+      sequence:
+        type: string
+        label: 'Variable'