diff -u b/lib/Drupal/monitoring/Sensor/Sensors/SensorPhpNotices.php b/lib/Drupal/monitoring/Sensor/Sensors/SensorPhpNotices.php
--- b/lib/Drupal/monitoring/Sensor/Sensors/SensorPhpNotices.php
+++ b/lib/Drupal/monitoring/Sensor/Sensors/SensorPhpNotices.php
@@ -35,7 +35,7 @@
     if (!empty($this->fetchedObject->variables)) {
       $variables = unserialize($this->fetchedObject->variables);
       $variables['%file'] = $this->shortenFilename($variables['%file']);
-      $result->setMessage('@count times: @error', ['@count' => (int) $this->fetchedObject->records_count, '@error' => new FormattableMarkup('%type: @message in %function (Line %line of %file).', $variables)]);
+      $result->setMessage('@count times: @error', ['@count' => (int) $this->fetchedObject->records_count, '@error' => t('%type: @message in %function (Line %line of %file).', $variables)]);
     };
   }
 
@@ -74,7 +74,7 @@
   /**
    * {@inheritdoc}
    */
-  public function verboseResultUnaggregated(array &$output) {
+  /*public function verboseResultUnaggregated(array &$output) {
     $output['verbose_sensor_result'] = array(
       '#theme' => 'table',
       '#title' => t('Unaggregated result'),
@@ -109,7 +109,7 @@
         $output['verbose_sensor_result']['#rows'][$delta]['wid'] = l($row['wid'], url('/admin/reports/dblog/event/' . $row['wid']));
 
         // Replace variables in message.
-        $output['verbose_sensor_result']['#rows'][$delta]['message'] = new FormattableMarkup($row['message'], unserialize($row['variables']));
+        $output['verbose_sensor_result']['#rows'][$delta]['message'] = t($row['message'], unserialize($row['variables']));
         // Do not render the raw message & variables in the row.
         unset($output['verbose_sensor_result']['#rows'][$delta]['variables']);
         $variables = unserialize($row['variables']);
@@ -134,7 +134,7 @@
     }
     $output['verbose_sensor_result']['#rows'] = $rows;
     $output['verbose_sensor_result']['#header'] = $this->buildTableHeader($rows);
-  }
+  }*/
 
   protected function buildTableHeader($rows = []) {
     $header = [
only in patch2:
unchanged:
--- a/monitoring.monitoring_sensors.inc
+++ b/monitoring.monitoring_sensors.inc
@@ -376,6 +376,21 @@ function monitoring_dblog_monitoring_sensor_info() {
     );
   }
 
+  $info['php_notices'] = array(
+    'label' => 'PHP notices (database log)',
+    'description' => 'Displays the most frequent PHP notices and errors.',
+    'sensor_class' => 'Drupal\monitoring\Sensor\Sensors\SensorPhpNotices',
+    'value_label' => 'Watchdog events',
+    'settings' => array(
+      'category' => 'Watchdog',
+      // Cache for one hour.
+      'caching_time' => 3600,
+      'table' => 'watchdog',
+      'time_interval_field' => 'timestamp',
+      'time_interval_value' => 60 * 60 * 24,
+    ),
+  );
+
   return $info;
 }