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Application performance management is merely the monitoring and management of software apps in terms of availability and performance.
As far as key performance indicators (KPIs), there are all kinds of them. This article on LinkedIn lists 75 across several categories, including financial performance, understanding your customers, gauging your market and marketing efforts, operational performance, and employee performance.
This article by an HP software executive cites seven key KPIs for IT organizations, including "change success rate," "percent of emergency changes," and "percent of SLAs met."