How to use OpenEdge.Logging component?

a) I'm trying to figure out the usage of OpenEdge.Logging component using very basic test. For the test I have place the logging.config file in a dir which is in propath and created a simple class but the log file is not created on the disk. Can someone point out what am I doing wrong here?

OS: Mint Linux, Progress Version: 11.7.5, Code executor: Progress Editor

1. logging.config file

{
    "DEFAULT_LOGGER": "OpenEdge",
    "logger": {
        "OpenEdge": {
            "logLevel": "ERROR",
            "filters": [
                "LOG_MANAGER_FORMAT",
                {
                    "filterName": "LOG_MANAGER_WRITER",
                    "fileName": "/tmp/OpenEdge.log",
                    "appendTo": true
                }
            ]
        },
        "TestLogging": {
            "logLevel": "ERROR",
            "filters": [
                "LOG_MANAGER_FORMAT",
                {
                    "filterName": "LOG_MANAGER_WRITER",
                    "fileName": "/tmp/TestLogging.log",
                    "appendTo": true
                }
            ]
        }
    }
}

2. TestLogging.cls

using OpenEdge.Logging.ILogWriter.
using OpenEdge.Logging.LoggerBuilder.

class TestLogging:
    define variable logger as ILogWriter no-undo.

constructor TestLogging():
    MESSAGE SEARCH("logging.config").
    logger = LoggerBuilder:GetLogger(GET-CLASS(TestLogging)).
    logger:Info("Customer record found").
    logger:Warn("CUSTOMER-MESSAGES", "Customer record missing").
end.

end class.

b)  Eventually I want to produce logs using logging framework/component in JSON format readable by LogStash, so it would be nice it someone can also point out to a reference implementation. We are simply using ABL client and not PASOE, BPM etc.