Visual Console Refactor: fixed the module graph element

Former-commit-id: baee256acdbc28c3b2d0364b97f301f776121e36

pandora_console/include/rest-api/models/VisualConsole/Items/ModuleGraph.php

@@ -193,6 +193,18 @@ final class ModuleGraph extends Item
             }
         }
 
+        /*
+         * About the 30 substraction to the graph height:
+         * The function which generates the graph doesn't respect the
+         * required height. It uses it for the canvas (the graph itself and
+         * their axes), but then it adds the legend. One item of the legend
+         * (one dataset) is about 30px, so we need to substract that height
+         * from the canvas to try to fit the element's height.
+         *
+         * PD: The custom graphs can have more datasets, but we only substract
+         * the height of one of it to replicate the legacy functionality.
+         */
+
         // Custom graph.
         if (empty($customGraphId) === false) {
             $customGraph = \db_get_row_filter(
@@ -204,7 +216,7 @@ final class ModuleGraph extends Item
             $params = [
                 'period'          => $period,
                 'width'           => $data['width'],
-                'height'          => $data['height'],
+                'height'          => ($data['height'] - 30),
                 'title'           => '',
                 'unit_name'       => null,
                 'show_alerts'     => false,
@@ -237,7 +249,7 @@ final class ModuleGraph extends Item
                 'period'          => $period,
                 'show_events'     => false,
                 'width'           => $data['width'],
-                'height'          => $data['height'],
+                'height'          => ($data['height'] - 30),
                 'title'           => \modules_get_agentmodule_name($moduleId),
                 'unit'            => \modules_get_unit($moduleId),
                 'only_image'      => $imageOnly,