AlertingNG: Add a global registry for notification channels (#32781)

Signed-off-by: Ganesh Vernekar <ganeshvern@gmail.com>

pkg/services/ngalert/notifier/alertmanager.go

@@ -25,6 +25,7 @@ import (
 
 	"github.com/grafana/grafana/pkg/infra/log"
 	"github.com/grafana/grafana/pkg/registry"
+	"github.com/grafana/grafana/pkg/services/alerting"
 	ngmodels "github.com/grafana/grafana/pkg/services/ngalert/models"
 	"github.com/grafana/grafana/pkg/services/ngalert/notifier/channels"
 	"github.com/grafana/grafana/pkg/services/ngalert/store"
@@ -305,3 +306,29 @@ func timeoutFunc(d time.Duration) time.Duration {
 	}
 	return d + waitFunc()
 }
+
+// GetAvailableNotifiers returns the metadata of all the notification channels that can be configured.
+func (am *Alertmanager) GetAvailableNotifiers() []*alerting.NotifierPlugin {
+	return []*alerting.NotifierPlugin{
+		{
+			Type:        "email",
+			Name:        "Email",
+			Description: "Sends notifications using Grafana server configured SMTP settings",
+			Heading:     "Email settings",
+			Options: []alerting.NotifierOption{
+				{
+					Label:        "Single email",
+					Description:  "Send a single email to all recipients",
+					Element:      alerting.ElementTypeCheckbox,
+					PropertyName: "singleEmail",
+				}, {
+					Label:        "Addresses",
+					Description:  "You can enter multiple email addresses using a \";\" separator",
+					Element:      alerting.ElementTypeTextArea,
+					PropertyName: "addresses",
+					Required:     true,
+				},
+			},
+		},
+	}
+}