Currently, warnings are visually "enhanced" with a ⛔ sign.
However, the warning signs are ⚠️ or its slightly different European
version.

-- 
Fragen sind nicht da um beantwortet zu werden,
Fragen sind da um gestellt zu werden
Georg Kreisler

Headaches with a Juju log:
unit-basic-16: 09:17:36 WARNING juju.worker.uniter.operation we should run
a leader-deposed hook here, but we can't yet