Overview
Opsview (fault monitoring software) is the preferred, established platform for systems monitoring within Yale ITS. One of its features is out-of-the-box integration with Service Desk functions, including RT/Jira/ServiceNow.
Opsview is a commercial fork of Nagios. Their codebases are extremely similar and have many of the same integration points.
There is a Confluence Space dedicated to Yale's implementation of Opsview here.
Opsview Integration Architecture
The opsview-servicedesk-connector package for Red Hat Enterprise Linux (RHEL) allows for this integration via opsview-notifications. Events are recorded in a relational database (MySQL) and are shunted to Service Now. They enter Service Now as HTTP POSTs using credentials.