Spark plug replacement at 120k

I pulled the plugs for 120k service, service record shows plugs were done at 90k by the dealership. The plug for cylinder 6 has some deposits on it that has me worried. Wondering if it warrants a trip to the dealership? I have an extended warranty on the truck for another 25k miles.

Here is a shot of the plug:

 

That plug looks normal to me. Whats the gap at?

 

I didn’t check when I pulled but I will check the gap in the morning.

Here are the other two plugs from the cylinders 2/4 for reference:

 

Perfectly fine, it’s carbon buildup. As long as there isnt oil on the plugs dont worry.

 

Thanks @Matmo215,

Plugs were all dry when I pulled them.