Alerting: Fix and re-enable `filters instance labels in log line` test (#65618)

Fix and reenable test

pkg/services/ngalert/state/historian/loki.go

@@ -5,6 +5,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"math"
+	"sort"
 	"time"
 
 	"github.com/benbjohnson/clock"
@@ -360,8 +361,14 @@ func buildLogQuery(query models.HistoryQuery) (string, error) {
 	logQL := selectorString(selectors)
 
 	labelFilters := ""
-	for k, v := range query.Labels {
+	labelKeys := make([]string, 0, len(query.Labels))
-		labelFilters += fmt.Sprintf(" | labels_%s=%q", k, v)
+	for k := range query.Labels {
+		labelKeys = append(labelKeys, k)
+	}
+	// Ensure that all queries we build are deterministic.
+	sort.Strings(labelKeys)
+	for _, k := range labelKeys {
+		labelFilters += fmt.Sprintf(" | labels_%s=%q", k, query.Labels[k])
 	}
 
 	if labelFilters != "" {

pkg/services/ngalert/state/historian/loki_test.go

@@ -183,18 +183,17 @@ func TestRemoteLokiBackend(t *testing.T) {
 				},
 				exp: `{orgID="123",from="state-history",ruleUID="rule-uid"}`,
 			},
-			// TODO this case is flaky - investigate and re-enable. ref: https://drone.grafana.net/grafana/grafana/108325/3/7
+			{
-			//{
+				name: "filters instance labels in log line",
-			//	name: "filters instance labels in log line",
+				query: models.HistoryQuery{
-			//	query: models.HistoryQuery{
+					OrgID: 123,
-			//		OrgID: 123,
+					Labels: map[string]string{
-			//		Labels: map[string]string{
+						"customlabel": "customvalue",
-			//			"customlabel": "customvalue",
+						"labeltwo":    "labelvaluetwo",
-			//			"labeltwo":    "labelvaluetwo",
+					},
-			//		},
+				},
-			//	},
+				exp: `{orgID="123",from="state-history"} | json | labels_customlabel="customvalue" | labels_labeltwo="labelvaluetwo"`,
-			//	exp: `{orgID="123",from="state-history"} | json | labels_customlabel="customvalue" | labels_labeltwo="labelvaluetwo"`,
+			},
-			//},
 		}
 
 		for _, tc := range cases {