Network Operations "Metrics"

CEO's are judged by their company's profitability, long-term growth, efficiency, etc. Students are judged based on quizes, reports, mid-terms and finals. The economy is tracked by tracking individual sectors, quarter-to-quarter and year-over-year performance, unemployment, interest rates, etc. What metrics are used to measure networks and network operators? What "micro" measurements (the equivalent of tracking travel expenses or cost-of-sales to ensure overall profitability) are used to ensure good macro-level (up-time, network reliability, application performance, happy customers)? What systems/processes do you use to track all of this information, and associate it to overall business success? Thanks. Pete.