function cleanupByFilter() {
  deleteEmails('from:notifications@github.com older_than:7d subject: "Run failed"')
  // For more filters add more `deleteEmails` function executions here
}

function deleteEmails(filter) {
  var threads = GmailApp.search(filter);
  Logger.log("Deleting " + threads.length + " messages from filter: " + filter)
   for (var i = 0; i < threads.length; i++) {
      var messages = threads[i].getMessages();
      for (var j = 0; j < messages.length; j++) {
         var message = messages[j];
         message.markRead()
         message.moveToTrash()
      }
   }
}