Alertmanager: Adds support for basic auth (#23231)

Add basicauth username and password to the alertmanager notifier UI

docs/sources/administration/provisioning.md

@@ -398,6 +398,8 @@ The following sections detail the supported settings for each alert notification
 | Name |
 | ---- |
 | url |
+| basicAuthUser |
+| basicAuthPassword |
 
 #### Alert notification `teams`
 

pkg/services/alerting/notifiers/alertmanager.go

@@ -24,6 +24,15 @@ func init() {
         	<span class="gf-form-label width-10">Url</span>
         	<input type="text" required class="gf-form-input max-width-26" ng-model="ctrl.model.settings.url" placeholder="http://localhost:9093"></input>
 		</div>
+		<div class="gf-form">
+        	<span class="gf-form-label width-10">Basic Auth User</span>
+        	<input type="text" required class="gf-form-input max-width-26" ng-model="ctrl.model.settings.basicAuthUser" placeholder=""></input>
+		</div>
+		<div class="gf-form">
+        	<span class="gf-form-label width-10">Basic Auth Password</span>
+        	<input type="text" required class="gf-form-input max-width-26" ng-model="ctrl.model.settings.basicAuthPassword" placeholder=""></input>
+		</div>
+      </div>
     `,
 	})
 }
@@ -34,10 +43,14 @@ func NewAlertmanagerNotifier(model *models.AlertNotification) (alerting.Notifier
 	if url == "" {
 		return nil, alerting.ValidationError{Reason: "Could not find url property in settings"}
 	}
+	basicAuthUser := model.Settings.Get("basicAuthUser").MustString()
+	basicAuthPassword := model.Settings.Get("basicAuthPassword").MustString()
 
 	return &AlertmanagerNotifier{
 		NotifierBase:      NewNotifierBase(model),
 		URL:               url,
+		BasicAuthUser:     basicAuthUser,
+		BasicAuthPassword: basicAuthPassword,
 		log:               log.New("alerting.notifier.prometheus-alertmanager"),
 	}, nil
 }
@@ -46,6 +59,8 @@ func NewAlertmanagerNotifier(model *models.AlertNotification) (alerting.Notifier
 type AlertmanagerNotifier struct {
 	NotifierBase
 	URL               string
+	BasicAuthUser     string
+	BasicAuthPassword string
 	log               log.Logger
 }
 
@@ -140,6 +155,8 @@ func (am *AlertmanagerNotifier) Notify(evalContext *alerting.EvalContext) error
 
 	cmd := &models.SendWebhookSync{
 		Url:        am.URL + "/api/v1/alerts",
+		User:       am.BasicAuthUser,
+		Password:   am.BasicAuthPassword,
 		HttpMethod: "POST",
 		Body:       string(body),
 	}