Disable top active servers metric widget on the admin dashboard

Author: Hanage999

config/initializers/disable_servers_dimension.rb

@@ -0,0 +1,20 @@
+# frozen_string_literal: true
+#
+# Remove the “servers” dimension so the “Top active servers” widget
+# disappears from the admin dashboard and its heavy SQL is never run.
+#
+Rails.application.config.after_initialize do
+  next unless defined?(Admin::Metrics::Dimension::DIMENSIONS)
+
+  # ① DIMENSIONS は frozen なので dup して編集
+  new_dimensions = Admin::Metrics::Dimension::DIMENSIONS.dup
+  removed = new_dimensions.delete(:servers)
+
+  # ② ‘servers’ が存在していれば定数を差し替え
+  if removed
+    Admin::Metrics::Dimension.send(:remove_const, :DIMENSIONS)
+    Admin::Metrics::Dimension.const_set(:DIMENSIONS, new_dimensions.freeze)
+
+    Rails.logger.info('[init] “Top active servers” widget disabled (servers dimension removed)')
+  end
+end