Reduces the plugin registry report to those plugins that do not implement the Privacy API yet (Screenshot: https://pasteboard.co/HlBmyul.png)

moodle-tool_dataprivacy-filter.diff

diff --git a/classes/metadata_registry.php b/classes/metadata_registry.php
index 6282cc4..90164e2 100644
--- a/classes/metadata_registry.php
+++ b/classes/metadata_registry.php
@@ -38,7 +38,7 @@ class metadata_registry {
      *
      * @return array An array with all of the plugin types / plugins and the user data they store.
      */
-    public function get_registry_metadata() {
+    public function get_registry_metadata($onlynoncompliant = false) {
         $manager = new \core_privacy\manager();
         $manager->set_observer(new \tool_dataprivacy\manager_observer());
 
@@ -77,6 +77,13 @@ class metadata_registry {
                 }
                 return $internaldata;
             }, $leaves['plugins']);
+
+            if ($onlynoncompliant) {
+                $plugins = array_values(array_filter($plugins, function ($plugin) {
+                    return !$plugin['compliant'];
+                }));
+            }
+
             $fullyrichtree[$branch]['plugin_type_raw'] = $plugintype;
             // We're done using the plugin type. Convert it to a readable string.
             $fullyrichtree[$branch]['plugin_type'] = $pluginman->plugintype_name($plugintype);
diff --git a/pluginregistry.php b/pluginregistry.php
index 060bd81..934d368 100644
--- a/pluginregistry.php
+++ b/pluginregistry.php
@@ -27,6 +27,7 @@ require_once($CFG->dirroot . '/' . $CFG->admin . '/tool/dataprivacy/lib.php');
 
 $contextlevel = optional_param('contextlevel', CONTEXT_SYSTEM, PARAM_INT);
 $contextid = optional_param('contextid', 0, PARAM_INT);
+$onlynoncompliant = optional_param('onlynoncompliant', 0, PARAM_BOOL);
 
 $url = new moodle_url('/' . $CFG->admin . '/tool/dataprivacy/pluginregistry.php');
 $title = get_string('pluginregistry', 'tool_dataprivacy');
@@ -38,7 +39,7 @@ echo $output->header();
 
 // Get data!
 $metadatatool = new \tool_dataprivacy\metadata_registry();
-$metadata = $metadatatool->get_registry_metadata();
+$metadata = $metadatatool->get_registry_metadata($onlynoncompliant === 1);
 
 $dataregistry = new tool_dataprivacy\output\data_registry_compliance_page($metadata);