So I stop by the store for maybe 10 minutes, and when I come back out I see this:
It's not much, but it's definitely from the bike, 'cause I can see trails down the engine casing. Seems to be from somewhere in the area where the coolant hose enters the engine on the left side of the bike. However, riding it back home and parking it revealed no further leaks hours later. How concerned should I be? Palpating the coolant hose doesn't reveal any splits or leaks that I can find.

It's not much, but it's definitely from the bike, 'cause I can see trails down the engine casing. Seems to be from somewhere in the area where the coolant hose enters the engine on the left side of the bike. However, riding it back home and parking it revealed no further leaks hours later. How concerned should I be? Palpating the coolant hose doesn't reveal any splits or leaks that I can find.