Ah, from the journal.log:
Command line: BOOT_IMAGE=/boot/vmlinuz-5.3.0-1008-azure root=PARTUUID=1261a2c6-48ca-43ee-9b70-197f5b89b82c ro console=tty1 console=ttyS0 earlyprintk=ttyS0 panic=-1
Ah, from the journal.log:
Command line: BOOT_IMAGE= /boot/vmlinuz- 5.3.0-1008- azure root=PARTUUID= 1261a2c6- 48ca-43ee- 9b70-197f5b89b8 2c ro console=tty1 console=ttyS0 earlyprintk=ttyS0 panic=-1