When HKT ship calendars and UTC warehouses disagree
A go / hold decision can flip when midnight moves—not when the build does.
Release teams in Hong Kong often mix UTC event stores with HKT ship calendars. A gate window that spans the wrong midnight rewrites every error-budget cell without a single feature change.
Pipeline upgrades that change how version labels stitch create similar ghosts. Returning builds look new; rollback rates swing for telemetry reasons.
Before celebrating a safer gate, list pipeline versions, identity rules for builds, and timezone settings beside the chart. Our Release Gate Review always opens with that checklist.