"Data source connected and labels found." But no logs is found from my Docker containers in Grafana/Loki

I’m trying to capture logs from all of my docker containers with Grafana+Loki
by using the Docker Driver Plugin and by changing the default Docker logging driver

When I choose Loki as the Data source in Grafana and enters Loki:3100 as the URL in the settings for the Data source and press Save & Test, I get the message Data source connected and labels found. but no logs is found when I write {container_name=mycontainer} in the Explorer page.

docker-compose.yml

version: '3.8'

    services:
     grafana:
        image: grafana/grafana:latest
        container_name: grafana
        volumes:
        - storage:/var/lib/grafana
        expose:
         - 3000
        networks:
        - main
        restart: unless-stopped
        depends_on: 
         - loki

     loki:
        image: grafana/loki:latest
        container_name: loki
        volumes:
        - loki:/etc/loki/
        expose:
         - 3100
        networks:
        - main
        restart: unless-stopped

    volumes:
     storage:
     loki:

    networks:
     main:
      external: true

daemon.js

{
    "debug" : true,
    "log-driver": "loki",
    "log-opts": {
        "loki-url": "http://loki:3100/loki/api/v1/push"
    }
}

local-config.yml for loki

auth_enabled: false

server:
  http_listen_port: 3100

ingester:
  lifecycler:
    address: 0.0.0.0
    ring:
      kvstore:
        store: inmemory
      replication_factor: 1
    final_sleep: 0s
  chunk_idle_period: 1h       # Any chunk not receiving new logs in this time will be flushed
  max_chunk_age: 1h           # All chunks will be flushed when they hit this age, default is 1h
  chunk_target_size: 1048576  # Loki will attempt to build chunks up to 1.5MB, flushing first if chunk_idle_period or max_chunk_age is reached first
  chunk_retain_period: 30s    # Must be greater than index read cache TTL if using an index cache (Default index read cache TTL is 5m)
  max_transfer_retries: 0     # Chunk transfers disabled

schema_config:
  configs:
    - from: 2020-10-24
      store: boltdb-shipper
      object_store: filesystem
      schema: v11
      index:
        prefix: index_
        period: 24h

storage_config:
  boltdb_shipper:
    active_index_directory: /loki/boltdb-shipper-active
    cache_location: /loki/boltdb-shipper-cache
    cache_ttl: 24h         # Can be increased for faster performance over longer query periods, uses more disk space
    shared_store: filesystem
  filesystem:
    directory: /loki/chunks

compactor:
  working_directory: /loki/boltdb-shipper-compactor
  shared_store: filesystem

limits_config:
  reject_old_samples: true
  reject_old_samples_max_age: 168h

chunk_store_config:
  max_look_back_period: 0s

table_manager:
  retention_deletes_enabled: false
  retention_period: 0s

ruler:
  storage:
    type: local
    local:
      directory: /loki/rules
  rule_path: /loki/rules-temp
  alertmanager_url: http://localhost:9093
  ring:
    kvstore:
      store: inmemory
  enable_api: true