timeline UTC (anchor date only; source supplies no calendar date)
v2 deployment start: 14:00:00Z
v2 deployment complete: 14:00:20Z
first exception corrected from fast host clock: 14:00:40Z
alert: 14:01:00Z
first exception after deployment complete: 20s
alert after first exception: 20s
legacy record: v1=19.9900 (19.99 display); v2=19.9900 (19.99 display)
v2 record: v1=0.0000 (0.00 display); v2=0.1999 (0.20 display)