Feed Registry JSON

Return only items carrying this tag (e.g. upgrade, incident, subnet). Exact match against the item's tags array.

Inclusive lower bound on item timestamps, as an ISO-8601 date (2026-06-01, a whole UTC day) or date-time with an explicit offset. Malformed values are a 400, never silently ignored.

Inclusive upper bound, same format as since. A bare date covers the whole named UTC day.

Maximum items to return (1-50). Defaults to 50.