The histogram target behaves similarly to the event_counter target. The event_counter target counts the number of times that an event occurs. However, the histogram target lets you pick a grouping mechanism for the histogram. You can use either an action, or an event field.
For demonstration purposes, what I want to know is, per object in the database, how many times are the statistics automatically updated?
Read on to see the test, including event setup, data-building queries, and usage of the histogram itself.