Fixes #6859 use correct config setting

core/DataAccess/ArchiveInvalidator.php

@@ -136,13 +136,13 @@ class ArchiveInvalidator {
     {
         // If using the feature "Delete logs older than N days"...
         $purgeDataSettings = PrivacyManager::getPurgeDataSettings();
-        $logsAreDeletedBeforeThisDate = $purgeDataSettings['delete_logs_schedule_lowest_interval'];
+        $logsDeletedWhenOlderThanDays = $purgeDataSettings['delete_logs_older_than'];
         $logsDeleteEnabled = $purgeDataSettings['delete_logs_enable'];
 
         if ($logsDeleteEnabled
-            && $logsAreDeletedBeforeThisDate
+            && $logsDeletedWhenOlderThanDays
         ) {
-            $this->minimumDateWithLogs = Date::factory('today')->subDay($logsAreDeletedBeforeThisDate);
+            $this->minimumDateWithLogs = Date::factory('today')->subDay($logsDeletedWhenOlderThanDays);
         }
     }
 

plugins/CoreAdminHome/API.php

@@ -47,7 +47,7 @@ class API extends \Piwik\Plugin\API
      *
      * @param string $idSites Comma separated list of idSite that have had data imported for the specified dates
      * @param string $dates Comma separated list of dates to invalidate for all these websites
-     * @param string $period If specified (one of day, week, month, year, range) it will only delete archives for this period.
+     * @param string $period If specified (one of day, week, month, year, range) it will only invalidates archives for this period.
      *                      Note: because week, month, year, range reports aggregate day reports then you need to specifically invalidate day reports to see
      *                      other periods reports processed..
      * @throws Exception