Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/statistics/config/schema/statistics.schema.yml

@@ -0,0 +1,33 @@
+# Schema for the configuration files of the statistics module.
+
+statistics.settings:
+  type: config_object
+  label: 'Statistics settings'
+  mapping:
+    access_log:
+      type: mapping
+      label: 'Access log settings'
+      mapping:
+        enabled:
+          type: boolean
+          label: 'Enable'
+        max_lifetime:
+          type: integer
+          label: 'Maximum lifetime'
+    count_content_views:
+      type: integer
+      label: 'Count content views'
+
+block.settings.statistics_popular_block:
+  type: block_settings
+  label: 'Popular content block settings'
+  mapping:
+    top_day_num:
+      type: integer
+      label: 'Number of day\s top views to display'
+    top_all_num:
+      type: integer
+      label: 'Number of all time views to display'
+    top_last_num:
+      type: integer
+      label: 'Number of most recent views to display'