@google-cloud/logging-bunyan not producing the logName i wrote in my code

Question

I am using the @google-cloud/logging-bunyan (^1.2.3) library with bunyan (^1.8.12) to produce some logs that would be saved to bigquery using a sink. I wanted to pass the logName attribute since it is used to create the table (table name). I am doing so since i want to have multiple table for the same backend (nodeJS 8.16.1). I carried a test using an app engine and it worked perfectly but after a deployed it to the GKE cluster, it did not print the logName the specified. Here is the code snippet i deployed to give you an idea :

import bunyan from 'bunyan';
import { LoggingBunyan } from '@google-cloud/logging-bunyan';

const loggingBunyan = new LoggingBunyan({
  logName: 'driver-status-location', // table name
});
export const driverLocationStatusLogger = bunyan.createLogger({
  name: 'yassir-backend-main-log',
  streams: [
    // Log to the console at 'info' and above
    { stream: process.stdout, level: 'info' },
    // And log to Stackdriver Logging, logging at 'info' and above
    loggingBunyan.stream('info'),
  ],
});

export const customDriverLocationStatusLogger = (action, metadata) =>{ 
    driverLocationStatusLogger.info({ labels: { action }, metadata});
}

and here is the format of the log i got :

{
 insertId: "hecxukciyeulfqocw"  
 jsonPayload: {…}  
 labels: {…}  
 logName: "projects/xxx-xx-xx/logs/stdout"  
 receiveTimestamp: "2019-10-10T09:10:16.034265465Z"  
 resource: {…}  
 severity: "INFO"  
 timestamp: "2019-10-10T09:10:15.292Z"  
}

as you see logName is not the one i specified. What do you think the problem is ?