What changed
No action needed unless you validate responses against a closed schema.
Affects GET /v1/drains.
Who is affected
Code that reads GET /v1/drains (drains[].deliveryStats).
Before and after
| Where | Before | After |
|---|---|---|
| GET /v1/drains · drains[].deliveryStats | absent | present |
| GET /v1/log-drains · drains[].deliveryStats | absent | present |
Based on Vercel’s published API specification. How severity is decided.