In bug 53771 Roan noted receiving an empty e-mail from wikitech:
To: Catrope <roan@wikimedia.org>
Subject: New notification at Wikitech
X-PHP-Originating-Script: 0:UserMailer.php
From: MediaWiki Mail <noc@wikimedia.org>
Reply-To: No Reply <noc@wikimedia.org>
Date: Wed, 04 Sep 2013 19:03:04 +0000
Message-ID: <labswiki.522783e832fdd3.58527144@wikitech.wikimedia.org>
X-Mailer: MediaWiki mailer
MIME-Version: 1.0
Content-type: text/plain; charset=UTF-8
Content-transfer-encoding: 8bit
You have a new notification.
To control which emails we send you, check your preferences:
https://wikitech.wikimedia.org/wiki/Special:Preferences#mw-prefsection-echo
Benny Situ commented that this is the "default notification message for email if a notification type doesn't define such message."
I got the same empty e-mail, and my notifications from Wikitech are all special ones from the OpenStack integration code, such as:
Hashar built instance 'deployment-sql03' in project Nova
Resource:Deployment-prep
so it sounds like this code needs to define some messages.
Version: unspecified
Severity: normal