title: Monitoring Performance metrics more than one GCP environment
body: <p>My requirement is to monitor performance metrics of GCP Environments. We have to monitor more than one GCP environment (Service Account). Now Problem is how can I set the all service Accounts JSON files in Environment variable "GOOGLE_APPLICATION_CREDENTIALS".</p>
  
  <p>creating MetricServiceClient like below after setting JSON file in an environment variable
   MetricServiceClient client = MetricServiceClient.create()</p>
  
  <p>Is there another way to create  MetricServiceClient using credentials.  </p>