As an administrator, I consider several key metrics essential for assessing Uber's performance in a newly introduced city: 1. User Growth Rate: This metric tracks the speed at which new customers are gained, reflecting Uber's acceptance within the new market. 2. Driver Retention Rate: This shows the proportion of drivers who continue to be active on the platform over a specified timeframe. 3. Active Users: This refers to the number of customers who utilize the service at least once a month, helping to assess market penetration and customer loyalty. 4. Customer Acquisition Cost (CAC): This represents the expense incurred to gain each new customer, which is vital for evaluating the success of marketing strategies. 5. Revenue Growth: This metric provides a clear picture of business expansion, influenced by factors such as the number of rides and average fare rates.