added property report_last_updated_message instead of overwriting a metadata property

core/Plugin/Visualization.php

@@ -62,6 +62,7 @@ class Visualization extends ViewDataTable
         $this->overrideSomeConfigPropertiesIfNeeded();
 
         try {
+
             $this->beforeLoadDataTable();
 
             $this->loadDataTableFromAPI();
@@ -171,7 +172,7 @@ class Visualization extends ViewDataTable
             $this->config->metadata = $this->dataTable->getAllTableMetadata();
 
             if (isset($this->config->metadata[DataTable::ARCHIVED_DATE_METADATA_NAME])) {
-                $this->config->metadata[DataTable::ARCHIVED_DATE_METADATA_NAME] = $this->makePrettyArchivedOnText();
+                $this->config->report_last_updated_message = $this->makePrettyArchivedOnText();
             }
         }
     }

core/ViewDataTable/Config.php

@@ -454,6 +454,7 @@ class Config
      */
     public $show_non_core_visualizations = true;
 
+    public $report_last_updated_message = false;
     public $metadata  = array();
     public $report_id = '';
 

plugins/CoreHome/templates/_dataTable.twig

@@ -11,7 +11,7 @@
      data-params="{% if clientSideParameters is empty %}{}{% else %}{{ clientSideParameters|json_encode }}{% endif %}">
     <div class="reportDocumentation">
         {% if properties.documentation|default is not empty %}<p>{{ properties.documentation|raw }}</p>{% endif %}
-        {% if properties.metadata.archived_date is defined %}<span class='helpDate'>{{ properties.metadata.archived_date }}</span>{% endif %}
+        {% if properties.report_last_updated_message is defined %}<span class='helpDate'>{{ properties.report_last_updated_message }}</span>{% endif %}
     </div>
     <div class="dataTableWrapper">
         {% if error is defined %}