Update: I was able to find some time to test the battery with my voltmeter this afternoon. Voltage looks fine with the ignition off - but as soon as I turn the ignition on the voltage drops to near 0. So I believe the battery is dead.
I think the next question is if the battery is bad or the charging system. I'm going to throw the battery on a charger overnight and see if it will hold a charge. If the battery holds a charge I'll likely take the bike to the shop to get the stator, etc. checked out.
I've been using Loki and promtail for containers I actually care about aggregating logs for. It's something relatively new for me but so far the experience has been positive.