Change ERROR to throttled WARN

nav2_costmap_2d/plugins/static_layer.cpp

@@ -331,7 +331,12 @@ StaticLayer::updateCosts(
     return;
   }
   if (!map_received_) {
-    RCLCPP_WARN(node_->get_logger(), "Can't update static costmap layer, no map received");
+    static int count = 0;
+    // throttle warning down to only 1/10 message rate
+    if (++count == 10) {
+      RCLCPP_WARN(node_->get_logger(), "Can't update static costmap layer, no map received");
+      count=0;
+    }
     return;
   }