Two legacy codes can normalise to the same label (eu_west and eu-west), and
separate counters then handed both of them eu-west-01 — a unique-constraint
failure inside the reservation, which blocks onboarding rather than being a DNS
problem the step can shrug off. Lock, counter and the in-use check all key off
the label now.
(The helper was also called label(), which HostStep already declares as the
step's display name — renamed.)
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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