code: @Override
      public String getDeploymentServerId() {
          String value = getValueFromConfig(DeploymentContext.ContextKey.serverId.getKey());
          if (value != null) {
              return value;
          } else {
              value = getValueFromConfig(DEPLOYMENT_SERVER_ID_PROPERTY);
          }
          if (value != null) {
              return value;
          } else {
              return super.getDeploymentServerId();
          }
      }
docs: Get the deployment environment. If property "archaius.deployment.serverId"
  is set in the system wide configuration, it will return it. Otherwise, it will return super.getDeploymentServerId().