Alerting: Support custom API URL for PagerDuty integration (#88007)

* fix assert in LINE
* fix pagerduty asserts

---------

Co-authored-by: Yuri Tseretyan <yuriy.tseretyan@grafana.com>

pkg/services/ngalert/api/tooling/definitions/contact_points.go

@@ -135,6 +135,7 @@ type PagerdutyIntegration struct {
 	Client    *string            `json:"client,omitempty" yaml:"client,omitempty" hcl:"client"`
 	ClientURL *string            `json:"client_url,omitempty" yaml:"client_url,omitempty" hcl:"client_url"`
 	Details   *map[string]string `json:"details,omitempty" yaml:"details,omitempty" hcl:"details"`
+	URL       *string            `json:"url,omitempty" yaml:"url,omitempty" hcl:"url"`
 }
 
 type PushoverIntegration struct {

pkg/services/ngalert/notifier/channels_config/available_channels.go

@@ -6,6 +6,7 @@ import (
 	"strings"
 
 	alertingOpsgenie "github.com/grafana/alerting/receivers/opsgenie"
+	alertingPagerduty "github.com/grafana/alerting/receivers/pagerduty"
 	alertingTemplates "github.com/grafana/alerting/templates"
 )
 
@@ -363,6 +364,14 @@ func GetAvailableNotifiers() []*NotifierPlugin {
 					InputType:    InputTypeText,
 					PropertyName: "details",
 				},
+				{ //New in 11.1
+					Label:        "URL",
+					Description:  "The URL to send API requests to",
+					Element:      ElementTypeInput,
+					InputType:    InputTypeText,
+					Placeholder:  alertingPagerduty.DefaultURL,
+					PropertyName: "url",
+				},
 			},
 		},
 		{