Modifications for supporting migration

pkg/api/alertmanager.go

@@ -304,5 +304,7 @@ func (r *ApiReceiver) Type() ReceiverType {
 }
 
 type GrafanaReceivers struct {
+	// required: true
+	DefaultReceiver         *GrafanaReceiver   `yaml:"default_receiver" json:"default_receiver"`
 	GrafanaManagedReceivers []*GrafanaReceiver `yaml:"grafana_managed_receiver_configs,omitempty" json:"grafana_managed_receiver_configs,omitempty"`
 }

pkg/api/cortex-ruler.go

@@ -157,6 +157,8 @@ type ExtendedUpsertAlertDefinitionCommand struct {
 	NoDataState         NoDataState            `json:"no_data_state" yaml:"no_data_state"`
 	ExecutionErrorState ExecutionErrorState    `json:"exec_err_state" yaml:"exec_err_state"`
 	Settings            map[string]interface{} `json:"settings" yaml:"settings"`
+	// Receivers are optional and used for migrating notification channels of existing alerts
+	Receivers []*GrafanaReceiver `json:"receivers" yaml:"receivers"`
 	// internal state
 	FolderUID      string   `json:"-" yaml:"-"`
 	DatasourceUIDs []string `json:"-" yaml:"-"`

spec.json

@@ -1057,7 +1057,13 @@
     },
     "ApiReceiver": {
       "type": "object",
+      "required": [
+        "default_receiver"
+      ],
       "properties": {
+        "default_receiver": {
+          "$ref": "#/definitions/GrafanaReceiver"
+        },
         "email_configs": {
           "type": "array",
           "items": {
@@ -1500,6 +1506,14 @@
           ],
           "x-go-name": "NoDataState"
         },
+        "receivers": {
+          "description": "Receivers are optional and used for migrating notification channels of existing alerts",
+          "type": "array",
+          "items": {
+            "$ref": "#/definitions/GrafanaReceiver"
+          },
+          "x-go-name": "Receivers"
+        },
         "settings": {
           "type": "object",
           "additionalProperties": {
@@ -1610,7 +1624,13 @@
     },
     "GrafanaReceivers": {
       "type": "object",
+      "required": [
+        "default_receiver"
+      ],
       "properties": {
+        "default_receiver": {
+          "$ref": "#/definitions/GrafanaReceiver"
+        },
         "grafana_managed_receiver_configs": {
           "type": "array",
           "items": {