{
    "gfw": {
      "flagshipUrl": "FLAGSHIP_URL",
      "apiUrl": "API_URL"
    },
    "rw": {
        "flagshipUrl": {
            "staging": "RW_FLAGSHIP_URL_STAGING",
            "production": "RW_FLAGSHIP_URL_PRODUCTION",
            "preproduction": "RW_FLAGSHIP_URL_PREPRODUCTION"
        }
    },
    "apiGateway":{
        "uri": "API_GATEWAY_URI",
        "externalUrl": "API_GATEWAY_EXTERNAL_URL",
        "queueUrl": "API_GATEWAY_QUEUE_URL",
        "queueProvider": "API_GATEWAY_QUEUE_PROVIDER",
        "queueName": "API_GATEWAY_QUEUE_NAME"
    },
    "redisLocal": {
        "host": "REDIS_PORT_6379_TCP_ADDR",
        "port": "REDIS_PORT_6379_TCP_PORT"
    },
    "mongodb": {
        "host": "MONGO_PORT_27017_TCP_ADDR",
        "database": "MONGO_PORT_27017_TCP_DATABASE",
        "port": "MONGO_PORT_27017_TCP_PORT"
    },
    "migrate":{
        "uri": "MIGRATE_URI"
    },
    "cartoDB":{
        "user": "CARTODB_USER"
    },
    "mails":{
        "statsRecipients": "STATS_RECIPIENTS"
    }
}

{
    "logger": {
        "level": "LOGGER_LEVEL"
    },
    "gfw": {
      "flagshipUrl": "FLAGSHIP_URL",
      "apiUrl": "API_URL"
    },
    "rw": {
        "flagshipUrl": {
            "staging": "RW_FLAGSHIP_URL_STAGING",
            "production": "RW_FLAGSHIP_URL_PRODUCTION",
            "preproduction": "RW_FLAGSHIP_URL_PREPRODUCTION"
        }
    },
    "apiGateway":{
        "uri": "API_GATEWAY_URI",
        "externalUrl": "API_GATEWAY_EXTERNAL_URL",
        "queueUrl": "API_GATEWAY_QUEUE_URL",
        "queueProvider": "API_GATEWAY_QUEUE_PROVIDER",
        "queueName": "API_GATEWAY_QUEUE_NAME"
    },
    "redisLocal": {
        "host": "REDIS_PORT_6379_TCP_ADDR",
        "port": "REDIS_PORT_6379_TCP_PORT"
    },
    "mongodb": {
        "host": "MONGO_PORT_27017_TCP_ADDR",
        "database": "MONGO_PORT_27017_TCP_DATABASE",
        "port": "MONGO_PORT_27017_TCP_PORT"
    },
    "migrate":{
        "uri": "MIGRATE_URI"
    },
    "cartoDB":{
        "user": "CARTODB_USER"
    },
    "mails":{
        "statsRecipients": "STATS_RECIPIENTS"
    }
}

Add env var to override logger level
Add env var to override logger level
