Glen Moffitt writes:

I have a double-pane window, downstairs on one end of the family room. It's
not very visible, being under the rear deck. Someone recently shot a small
hole, probably with a BB gun, which penetrated the outer pane. I'm looking
for advice on how to seal that up. I googled around, but surprisingly not
a lot there. Lots of articles on repairing broken windows or holes in
screens, but not this. Could not find anything on Amazon or on the sites of
Lowes or Home Depot. Any suggestions?

Some of these windows have lifetime guarantees.
Not sure about a BB gun, but it could be worth looking into.

I had a thermal window crack and they sent me replacement
panes, no questions asked.

Your window is most likely Argon filled.
Without the Argon, the window will be 6% less efficient:

http://www.weathermaster-window.com/glass.html

I don't think there is anything practical you can do about the
condensation you will see inside the window.