code: func NewClient(apiKey, appKey string) *Client {
  	baseUrl := os.Getenv("DATADOG_HOST")
  	if baseUrl == "" {
  		baseUrl = "https://app.datadoghq.com"
  	}
  
  	return &Client{
  		apiKey:       apiKey,
  		appKey:       appKey,
  		baseUrl:      baseUrl,
  		HttpClient:   http.DefaultClient,
  		RetryTimeout: time.Duration(60 * time.Second),
  	}
  }
docs: // NewClient returns a new datadog.Client which can be used to access the API
  // methods. The expected argument is the API key.