Vercel: meterReason can now return "retention_opt_out"

What changed

Producer-side tools call this additive. It breaks exhaustive switches, strict parsers and generated client enums.

Affects deploymentStorageRollout.meterReason on Team reachable from 3 operations.

New value: retention_opt_out.

can now return "retention_opt_out"

Who is affected

Code that reads Vercel's Team objects, used by 3 Vercel operations.

Before and after

Where	Before	After
Team.deploymentStorageRollout.meterReason	"high_retention_opt_in", "low_scheduled", "medium_scheduled"	"low_scheduled", "medium_scheduled", "retention_opt_out"

Code that breaks

switch (response.deploymentStorageRollout.meterReason) {
  // existing branches …
  // no branch for "retention_opt_out"
  default:
    throw new Error("unexpected meterReason");
}

Based on Vercel’s published API specification. How severity is decided.