Black dots on tomatoes?

1st year gardener here! Got the shade cloth set up yesterday and was poking around in the raised bed when I noticed all this. Tons of these black dots all over the leaves of both of my tomatoes, but they brush right off when touched. At first I thought maybe it was dirt sprayed up from watering, but the dots are up on the top leaves too? I also noticed a few spots of weird leaf deterioration, not sure if that’s related. Plants produced well till now, never had any issues and tbh still don’t it’s just finally too hot for them to flower and I want to put in more pepper varieties.

It almost seems like some sort of frass but I couldn’t find any pests on or under the leaves and both plants are in a caged garden bed. Any ideas? I don’t want to put seedlings in if I have an invisible pest problem.