Issue #3212318: Improvments for Follow tag statistics

src/Plugin/KPIVisualization/MorrisTagFollowGraphKPIVisualization.php

@@ -77,6 +77,13 @@ class MorrisTagFollowGraphKPIVisualization extends KPIVisualizationBase {
       ->count()
       ->execute();
 
+    $new_followers = $flagging_storage->getAggregateQuery()
+      ->condition('entity_id', $tids, 'IN')
+      ->condition('created', strtotime('first day of this month'), '>=')
+      ->groupBy('uid')
+      ->count()
+      ->execute();
+
     $ymax = 0;
 
     $diff = 0;
@@ -113,7 +120,7 @@ class MorrisTagFollowGraphKPIVisualization extends KPIVisualizationBase {
       '#type' => 'bar',
       '#uuid' => $uuid,
       '#followers' => $flags,
-      '#difference' => $diff,
+      '#difference' => $new_followers,
       '#attached' => [
         'library' => [
           'kpi_analytics/morris',