sentinel_tunnel documentation

[Win32Sector]

Hello!
Can you explain about what means the Name in Databases?
Is it mastername from command redis-cli -p 26379 sentinel masters

1)  1) "name"
    2) "mymaster"

Or it is db0 - from command redis-cli -p 6379 info keyspace

# Keyspace
db0:keys=1,expires=0,avg_ttl=0

I try to setup sentinel tunnel for my redis with sentinels and I see in sentinel-tunnel logs

2020-12-03T11:21:20.137362659Z err:  first char in mbulk is not *
2020-12-03T11:21:20.137422559Z 2020/12/03 11:21:20 error : cannot get db address for  db0 , failed to retrieve db name from the sentinel, db_name:db0 

I tried this config

    {
        "Sentinels_addresses_list":[
          "my-redis-1:26379",
          "my-redis-2:26379",
          "my-redis-3:26379"
        ],
        "Databases":[
          {
            "Name":"db0",
            "Local_port":"6379"
          }
        ]
    }

I tried "mymaster" Name, but it doesn't work.