Looks like old damage to me, Greg. The newer leaves up high have no holes. I think the culprit has probably flown the coop. If it was slugs or snails, the trails don't last that long especially in rainy weather. (it doesn't rain where you are, right?
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If you start noticing holes again, try going out at night with a flashlight, and look on the undersides as well as the tops of the leaves. I had a type of weevil here that did that kind of damage to my Knockout roses. I don't think you have them up there but could be something similar. The wily little beggars hid on the undersides of the leaves during the day and then came out and dined on the leaves during the night. So I made it an entertainment to go out with a flashlight at night and pick them off the plants by hand. Worked well. I just dropped them in a cup of soapy water, or on a paver and stepped on them. Didn't want to drop them on the ground, though, because they are diggers and lay their eggs in the ground, so if you drop them there they quickly disappear.
If it's not leaf-chewing weevils, you will also see slugs and snails at night.
