Ahh the infamous Gas line bond!
That was a recent change in code here I think within the last 10 years and we are now required to do it. Only problem is recently we have had an inspector going around checking rental properties in the city and he is making us bond all gas lines in the older units, among other things that were code compliant some years ago but "aren't" now.And 2 romex under one staple.. Forbidden here for years. Surprised the inspector in this area with the "fine tooth comb" hasn't made us change that in the older buildings either.

A.D