IcingaNotificationForm: explain time units

fixes #1897

application/forms/IcingaNotificationForm.php

@@ -197,7 +197,7 @@ class IcingaNotificationForm extends DirectorObjectForm
                 'label' => $this->translate('First notification delay'),
                 'description' => $this->translate(
                     'Delay unless the first notification should be sent'
-                )
+                ) . '. ' . $this->getTimeValueInfo()
             )
         );
 
@@ -208,13 +208,21 @@ class IcingaNotificationForm extends DirectorObjectForm
                 'label' => $this->translate('Last notification'),
                 'description' => $this->translate(
                     'When the last notification should be sent'
-                )
+                ) . '. ' . $this->getTimeValueInfo()
             )
         );
 
         return $this;
     }
 
+    protected function getTimeValueInfo()
+    {
+        return $this->translate(
+            'Unit is seconds unless a suffix is given. Supported suffixes include'
+            . ' ms (milliseconds), s (seconds), m (minutes), h (hours) and d (days).'
+        );
+    }
+
     /**
      * @return self
      */

doc/82-Changelog.md

@@ -29,6 +29,7 @@ next (will be 1.8.0)
 * FEATURE: Notification Apply Rules as a DirectorObject DataField (#2199)
 * FEATURE: Hint and Error styling has been unified and improved
 * FEATURE: Form field rendering for sets now deals with invalid values
+* FEATURE: Better description for time-based form fields (#1897)
 
 ### CLI
 * FEATURE: Deployment Status and related utilities (#2189)