I'm not a fan of metrics, because most metrics are indirect measures of the thing you're actually trying to increase. People focus on the metric, missing the actual point. That happens in business, engineering, and life.
Distance ridden, weight, time, are things easily measured. Happiness and joy are hard to measure. So we measured the things we can, improve then, and hope that improves the things we can't measure. It's a silly way to go about things.
Ride for joy.