Solid rollers with off set push rod hole issue.

Can't tell exactly if that damage is on the nose of the cam or the front or back side. From the pic, it looks like what we would call spalling which is due to excessive Hertz stresses from too much spring pressure for the material and/or incorrect or insufficiant heat treat. For example, iron core cams will spall before steel core ones, etc, etc. OEMs spend a LOT of time working to get this right as some of the cams are more aggressive than you'd think and can lead to this if the prod processes veer off where they're supposed to be.

Spalling typically occurs over the nose of the cam for engines that idle a lot (i.e. police cars, taxis, etc) but can also happen to those driven at low rpms. If it's on the front side of the lobe, the stresses go up due to the acceleration rates of the cam profile and higher rpm's and, if the stresses exceed the material strength, you get that type of spalling. If it looks like all of the damage is offset to the side where the pushrod loads would be the most, this type of failure could well be the issue.

Not saying for sure that's what it is as I can't see it in my hands to review but it looks mighty similar.