The metrics that matter for each sales funnel, vary from one company to the next depending on the steps involved in the funnel

From For Entrepreneurs.com
Quote in Conversion Optimization

However there is a common way to measure each step, and the overall funnel, regardless of your sales process. That involves measuring two things for each step: the number of leads that went into the top of that step, and the conversion rate to the next step in the funnel.

Another key value of having these conversion rates is the ability to understand the implications of future forecasts. For example, lets say your company wants to do $4m in the next quarter. You can work backwards to figure out how many demos/trials that means, and given the sales productivity numbers – how many salespeople are required, and going back a stage earlier, how many leads are going to be required. These are crucial planning numbers that can change staffing levels, marketing program spend levels, etc.

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Customer Segmentation analysis will help point out which are your most profitable segments