Alerting: Support simplified routing receivers in Prometheus conversion API (#105135)

Adds ability to set notifications settings using the Prometheus conversion API.

The API now supports a new optional header: X-Grafana-Alerting-Notification-Settings which can be used to specify notification settings.

The value of the header is the AlertRuleNotificationSettings structure in JSON:
mimirtool rules load alerts.yaml --extra-headers 'X-Grafana-Alerting-Notification-Settings: {"receiver": "my-webhook", "group_by": ["cluster", "pod"]}'

pkg/services/ngalert/api/tooling/spec.json

@@ -1204,6 +1204,21 @@
             "name": "x-grafana-alerting-alert-rules-paused",
             "in": "header"
           },
+          {
+            "type": "string",
+            "name": "x-grafana-alerting-target-datasource-uid",
+            "in": "header"
+          },
+          {
+            "type": "string",
+            "name": "x-grafana-alerting-folder-uid",
+            "in": "header"
+          },
+          {
+            "type": "string",
+            "name": "x-grafana-alerting-notification-receiver",
+            "in": "header"
+          },
           {
             "name": "Body",
             "in": "body",
@@ -1479,6 +1494,21 @@
             "name": "x-grafana-alerting-alert-rules-paused",
             "in": "header"
           },
+          {
+            "type": "string",
+            "name": "x-grafana-alerting-target-datasource-uid",
+            "in": "header"
+          },
+          {
+            "type": "string",
+            "name": "x-grafana-alerting-folder-uid",
+            "in": "header"
+          },
+          {
+            "type": "string",
+            "name": "x-grafana-alerting-notification-receiver",
+            "in": "header"
+          },
           {
             "name": "Body",
             "in": "body",
@@ -4416,6 +4446,16 @@
         "receiver"
       ],
       "properties": {
+        "active_time_intervals": {
+          "description": "Override the times when notifications should not be muted. These must match the name of a mute time interval defined\nin the alertmanager configuration time_intervals section. All notifications will be suppressed unless they are sent\nat the time that matches any interval.",
+          "type": "array",
+          "items": {
+            "type": "string"
+          },
+          "example": [
+            "maintenance"
+          ]
+        },
         "group_by": {
           "description": "Override the labels by which incoming alerts are grouped together. For example, multiple alerts coming in for\ncluster=A and alertname=LatencyHigh would be batched into a single group. To aggregate by all possible labels\nuse the special value '...' as the sole label name.\nThis effectively disables aggregation entirely, passing through all alerts as-is. This is unlikely to be what\nyou want, unless you have a very low alert volume or your upstream notification system performs its own grouping.\nMust include 'alertname' and 'grafana_folder' if not using '...'.",
           "type": "array",
@@ -4443,7 +4483,7 @@
           "example": "30s"
         },
         "mute_time_intervals": {
-          "description": "Override the times when notifications should be muted. These must match the name of a mute time interval defined\nin the alertmanager configuration mute_time_intervals section. When muted it will not send any notifications, but\notherwise acts normally.",
+          "description": "Override the times when notifications should be muted. These must match the name of a mute time interval defined\nin the alertmanager configuration time_intervals section. When muted it will not send any notifications, but\notherwise acts normally.",
           "type": "array",
           "items": {
             "type": "string"
@@ -4468,6 +4508,12 @@
       "type": "object",
       "title": "AlertRuleNotificationSettingsExport is the provisioned export of models.NotificationSettings.",
       "properties": {
+        "active_time_intervals": {
+          "type": "array",
+          "items": {
+            "type": "string"
+          }
+        },
         "group_by": {
           "type": "array",
           "items": {
@@ -6427,6 +6473,12 @@
       "type": "object",
       "title": "NotificationPolicyExport is the provisioned file export of alerting.NotificiationPolicyV1.",
       "properties": {
+        "active_time_intervals": {
+          "type": "array",
+          "items": {
+            "type": "string"
+          }
+        },
         "continue": {
           "type": "boolean"
         },
@@ -7811,6 +7863,12 @@
       "description": "RouteExport is the provisioned file export of definitions.Route. This is needed to hide fields that aren't useable in\nprovisioning file format. An alternative would be to define a custom MarshalJSON and MarshalYAML that excludes them.",
       "type": "object",
       "properties": {
+        "active_time_intervals": {
+          "type": "array",
+          "items": {
+            "type": "string"
+          }
+        },
         "continue": {
           "type": "boolean"
         },
@@ -8988,7 +9046,6 @@
       }
     },
     "alertGroups": {
-      "description": "AlertGroups alert groups",
       "type": "array",
       "items": {
         "type": "object",
@@ -9150,7 +9207,6 @@
       }
     },
     "gettableAlerts": {
-      "description": "GettableAlerts gettable alerts",
       "type": "array",
       "items": {
         "type": "object",
@@ -9275,6 +9331,7 @@
       }
     },
     "gettableSilences": {
+      "description": "GettableSilences gettable silences",
       "type": "array",
       "items": {
         "type": "object",
@@ -9566,4 +9623,4 @@
       "type": "basic"
     }
   }
-}
+}