Is there a way to report on the maximum value per day that a metric reaches?

You can create a virtual datapoint on a graph that does domain aggregation (sum/min/max/average): https://www.logicmonitor.com/support/dashboards-and-widgets/managing-widgets/widget-configuration#Adding-Virtual-Datapoints-perform-a-calculation

The summary is over the entire timerange of the graph, so if you want to look at 30 days and see the max for each day, that's not what this does.