Add organization ID to client connection using header

client.go

@@ -30,6 +30,8 @@ type Config struct {
 	BasicAuth *url.Userinfo
 	// Client provides an optional HTTP client, otherwise a default will be used.
 	Client *http.Client
+	// OrgID provides an optional organization ID, ignored when using APIKey, BasicAuth defaults to last used org
+	OrgID string
 }
 
 // New creates a new Grafana client.
@@ -103,6 +105,8 @@ func (c *Client) newRequest(method, requestPath string, query url.Values, body i
 
 	if c.config.APIKey != "" {
 		req.Header.Add("Authorization", fmt.Sprintf("Bearer %s", c.config.APIKey))
+	} else if c.config.OrgID != "" {
+		req.Header.Add("X-Grafana-Org-Id", c.config.OrgID)
 	}
 
 	if os.Getenv("GF_LOG") != "" {

client_test.go

@@ -36,6 +36,23 @@ func TestNew_tokenAuth(t *testing.T) {
 	}
 }
 
+func TestNew_orgId(t *testing.T) {
+	const orgID = "456"
+	c, err := New("http://my-grafana.com", Config{OrgID: orgID})
+	if err != nil {
+		t.Fatalf("expected error to be nil; got: %s", err.Error())
+	}
+
+	expected := "http://my-grafana.com"
+	if c.baseURL.String() != expected {
+		t.Errorf("expected error: %s; got: %s", expected, c.baseURL.String())
+	}
+
+	if c.config.OrgID != orgID {
+		t.Errorf("expected error: %s; got: %s", orgID, c.config.OrgID)
+	}
+}
+
 func TestNew_invalidURL(t *testing.T) {
 	_, err := New("://my-grafana.com", Config{APIKey: "123"})