How do/ do you guys monitor the built in shaper usage in ISR and ASR routers?

During a monitoring tune up session it occurred to me that this might be interesting to monitor rather than have to calculate it from the sum of all the interfaces. Is that a thing and does anyone do it?

Back in the day you'd monitor your router capacity by keeping tabs on CPU and memory, but nowdays you have an ASR that's hardware is capable of 20Gbps but you only have the 2.5Gbps license so you can run out of throughput long before the CPU load ramps up. I can see how being able to plot a trend and see when you might need to look at upgrading the license might be useful.

Interested to hear your thoughts.