### vault.wal.write_controller.reject_fraction ((#vault-wal-write_controller-reject_fraction))

Metric type | Value   | Description
----------- | ------- | -----------
gauge       | number  | The estimated fraction of write requests that must be rejected to maintain cluster stability.

The [write controller](/vault/docs/concepts/adaptive-overload-protection) reject
fraction is an estimate between 0 and 1.