Version 1, deprecated in March 2025 with a sunset date of December, switched off in January.
the published sunset: 2025-12-31.
the actual switch-off: 2026-01-13.
why the delay: one consumer, whose deploy cadence is
"when something breaks", and a monitoring script at
another that nobody there knew about.
the usage log, in the final week:
integrator-D 41 requests
unknown-key 0
and the last 41 were their health check, which we told
them about and they switched.Nine months of overlap and the date still moved by a fortnight, which is what a published sunset actually buys — not a guarantee, but a conversation with a deadline attached. The usage log is what made the switch-off a decision rather than a hope, and the unknown key had gone quiet in October.