Alerting: Rule Modify Export APIs (#75322)

* extend RuleStore interface to get namespace by UID
* add new export API endpoints
* implement request handlers
* update authorization and wire handlers to paths
* add folder error matchers to errorToResponse
* add tests for export methods

pkg/services/ngalert/models/testing.go

@@ -4,8 +4,10 @@ import (
 	"encoding/json"
 	"fmt"
 	"math/rand"
+	"sync"
 	"time"
 
+	"github.com/google/uuid"
 	"github.com/grafana/grafana-plugin-sdk-go/data"
 
 	"github.com/grafana/grafana/pkg/expr"
@@ -92,6 +94,7 @@ func WithNotEmptyLabels(count int, prefix string) AlertRuleMutator {
 		rule.Labels = GenerateAlertLabels(count, prefix)
 	}
 }
+
 func WithUniqueID() AlertRuleMutator {
 	usedID := make(map[int64]struct{})
 	return func(rule *AlertRule) {
@@ -227,6 +230,29 @@ func WithLabel(key, value string) AlertRuleMutator {
 	}
 }
 
+func WithUniqueUID(knownUids *sync.Map) AlertRuleMutator {
+	return func(rule *AlertRule) {
+		uid := rule.UID
+		for {
+			_, ok := knownUids.LoadOrStore(uid, struct{}{})
+			if !ok {
+				rule.UID = uid
+				return
+			}
+			uid = uuid.NewString()
+		}
+	}
+}
+
+func WithQuery(query ...AlertQuery) AlertRuleMutator {
+	return func(rule *AlertRule) {
+		rule.Data = query
+		if len(query) > 1 {
+			rule.Condition = query[0].RefID
+		}
+	}
+}
+
 func GenerateAlertLabels(count int, prefix string) data.Labels {
 	labels := make(data.Labels, count)
 	for i := 0; i < count; i++ {