Every business function needs to align toward the Key Business Outcomes and conform to the constraints under which the business operates. In our example here, the deadline is for the business to launch this feature idea before the Big Art show. So, meeting timelines is already a necessary measure of success.
The other indicators of product technology measures could be quality, usability, response times, latency, reliability, data privacy, security, and so on. These are traditionally clubbed under NFRs (nonfunctional requirements). They are indicators of how the system has been designed or how the system operates, and are not really about user behavior. There is no aspect of a product that is nonfunctional or without a bearing on business outcomes. In that sense, nonfunctional requirements are a misnomer. NFRs are really technical success criteria. They are also a business stakeholder's decision, based on what outcomes the business wants to pursue.
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