| Option | KAFKA_CLIENT_RACK_ENV_VAR | |
| Description | Finds the name of the variable that holds the value of client.rack. | |
| Introduced Version | 1.86.0 | |
| Default | ZONE | |
        If KAFKA_CLIENT_RACK is not configured, LogScale
        can read the client.rack
        value from another environment variable (the default variable is
        ZONE). KAFKA_CLIENT_RACK_ENV_VAR
        is used to tell LogScale the name of that other environment
        variable.