When you have a flow meter, the most important statistic I need is GPM flow rate in each zone. That is the only way to know if you have an issue after the valve. You already have in your watering history total gallons and total time by zone. It should be simple to add another column and divide those two numbers. That number should remain relatively constant unless changes were made or there is a problem. This has been mentioned before and you say you are gathering information and were planning to add it to you 2020 Spring update it, but was in 2019 and it has not been done.