Welcome to QUADCRAZY! It's normal to get some metalization in the oil from normal wear. Was it allot of metal shavings?
Could be your piston, ring, or cylinder wall wearing down. If it's allot of shavings, I would be concerned, but there is little you can do about it. Maybe add an oil additive and just ride it. Eventually you may need a lower half rebuild.
It could be pieces to your connect rod bearing(the housing). Once it starts coming apart you get lots of bits and your engine still runs OK(for a while), the oil level is fine, etc. I don't know an easy way to check it.