presto-main/src/main/java/io/prestosql/server/security/KerberosConfig.java/KerberosConfig/setPrincipalHostname
class KerberosConfig:    @Config("http-server.authentication.krb5.principal-hostname")
    @LegacyConfig("http.server.authentication.krb5.principal-hostname")
    public KerberosConfig setPrincipalHostname(String principalHostname)
    {
        this.principalHostname = principalHostname;
        return this;
    }