If hashing algorithm is empty, use legacy key generation.

IsConnected waits with retries until Redis connection pools are connected.

`{"` in base64.

ErrKeyNotFound is a standard error for when a key is not found in the storage engine.

RedisCluster is a storage manager that uses the redis database.

Handler is a standard interface to a storage backend, used by AuthorisationManager to read and write key values to the backend.