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

Metric type | Value   | Description
----------- | ------- | -----------
gauge       | number  | Current derivative value computed by the write controller.

The `vault.wal.write_controller.d` metric has limited production use, but Vault
developers may find `vault.wal.write_controller.d` useful for tuning or
debugging controller behavior.