From 81710ca1f5e1fd870c19c65ec60aab5d237c811c Mon Sep 17 00:00:00 2001
From: Alexander Akhmetov <me@alx.cx>
Date: Tue, 16 Dec 2025 18:09:32 +0100
Subject: [PATCH] Alerting: Fix saving result_fingerprint in async alert state
 persister (#115005)

---
 pkg/services/ngalert/models/testing.go        |  6 ++++
 .../ngalert/store/instance_database.go        |  7 ++--
 .../ngalert/store/instance_database_test.go   | 36 +++++++++++--------
 3 files changed, 32 insertions(+), 17 deletions(-)

diff --git a/pkg/services/ngalert/models/testing.go b/pkg/services/ngalert/models/testing.go
index 886f13d029a..9542c35fce8 100644
--- a/pkg/services/ngalert/models/testing.go
+++ b/pkg/services/ngalert/models/testing.go
@@ -973,6 +973,12 @@ func (a AlertInstanceMutators) WithAnnotations(annotations InstanceAnnotations)
 	}
 }
 
+func (a AlertInstanceMutators) WithResultFingerprint(fp string) AlertInstanceMutator {
+	return func(i *AlertInstance) {
+		i.ResultFingerprint = fp
+	}
+}
+
 type Mutator[T any] func(*T)
 
 // CopyNotificationSettings creates a deep copy of NotificationSettings.
diff --git a/pkg/services/ngalert/store/instance_database.go b/pkg/services/ngalert/store/instance_database.go
index a9d57d1ab8f..cc385ef4c63 100644
--- a/pkg/services/ngalert/store/instance_database.go
+++ b/pkg/services/ngalert/store/instance_database.go
@@ -364,10 +364,10 @@ func (st InstanceDBStore) insertInstancesBatch(sess *sqlstore.DBSession, batch [
 
 	query := strings.Builder{}
 	placeholders := make([]string, 0, len(batch))
-	args := make([]any, 0, len(batch)*13)
+	args := make([]any, 0, len(batch)*14)
 
 	query.WriteString("INSERT INTO alert_instance ")
-	query.WriteString("(rule_org_id, rule_uid, labels, labels_hash, current_state, current_reason, current_state_since, current_state_end, last_eval_time, fired_at, resolved_at, last_sent_at, annotations) VALUES ")
+	query.WriteString("(rule_org_id, rule_uid, labels, labels_hash, current_state, current_reason, current_state_since, current_state_end, last_eval_time, fired_at, resolved_at, last_sent_at, result_fingerprint, annotations) VALUES ")
 
 	for _, instance := range batch {
 		if err := models.ValidateAlertInstance(instance); err != nil {
@@ -387,7 +387,7 @@ func (st InstanceDBStore) insertInstancesBatch(sess *sqlstore.DBSession, batch [
 			continue
 		}
 
-		placeholders = append(placeholders, "(?,?,?,?,?,?,?,?,?,?,?,?,?)")
+		placeholders = append(placeholders, "(?,?,?,?,?,?,?,?,?,?,?,?,?,?)")
 		args = append(args,
 			instance.RuleOrgID,
 			instance.RuleUID,
@@ -401,6 +401,7 @@ func (st InstanceDBStore) insertInstancesBatch(sess *sqlstore.DBSession, batch [
 			nullableTimeToUnix(instance.FiredAt),
 			nullableTimeToUnix(instance.ResolvedAt),
 			nullableTimeToUnix(instance.LastSentAt),
+			instance.ResultFingerprint,
 			annotationsJSON,
 		)
 	}
diff --git a/pkg/services/ngalert/store/instance_database_test.go b/pkg/services/ngalert/store/instance_database_test.go
index 3cf264d4a36..4f833d0fd17 100644
--- a/pkg/services/ngalert/store/instance_database_test.go
+++ b/pkg/services/ngalert/store/instance_database_test.go
@@ -8,6 +8,8 @@ import (
 	"time"
 
 	"github.com/golang/snappy"
+	"github.com/google/go-cmp/cmp"
+	"github.com/google/go-cmp/cmp/cmpopts"
 	"github.com/grafana/grafana/pkg/util/testutil"
 	"github.com/stretchr/testify/require"
 	"google.golang.org/protobuf/proto"
@@ -391,27 +393,33 @@ func TestIntegrationFullSync(t *testing.T) {
 
 	t.Run("Should save all instances when batch size is bigger than 1", func(t *testing.T) {
 		batchSize = 2
-		newRuleUID := "y"
-		err := ng.InstanceStore.FullSync(ctx, append(instances, *models.AlertInstanceGen(models.InstanceMuts.WithOrgID(orgID), models.InstanceMuts.WithRuleUID(newRuleUID))), batchSize, nil)
+		testInstances := []models.AlertInstance{
+			*models.AlertInstanceGen(models.InstanceMuts.WithOrgID(orgID), models.InstanceMuts.WithRuleUID("batch1"), models.InstanceMuts.WithResultFingerprint("fp0")),
+			*models.AlertInstanceGen(models.InstanceMuts.WithOrgID(orgID), models.InstanceMuts.WithRuleUID("batch2"), models.InstanceMuts.WithResultFingerprint("fp1")),
+			*models.AlertInstanceGen(models.InstanceMuts.WithOrgID(orgID), models.InstanceMuts.WithRuleUID("batch3"), models.InstanceMuts.WithResultFingerprint("fp2")),
+		}
+
+		err := ng.InstanceStore.FullSync(ctx, testInstances, batchSize, nil)
 		require.NoError(t, err)
 
 		res, err := ng.InstanceStore.ListAlertInstances(ctx, &models.ListAlertInstancesQuery{
 			RuleOrgID: orgID,
 		})
 		require.NoError(t, err)
-		require.Len(t, res, len(instances)+1)
-		for _, ruleUID := range append(ruleUIDs, newRuleUID) {
-			found := false
-			for _, instance := range res {
-				if instance.RuleUID == ruleUID {
-					found = true
-					continue
-				}
-			}
-			if !found {
-				t.Errorf("Instance with RuleUID '%s' not found", ruleUID)
-			}
+
+		savedInstances := make([]models.AlertInstance, len(res))
+		for i, r := range res {
+			savedInstances[i] = *r
 		}
+
+		opts := []cmp.Option{
+			cmpopts.EquateApproxTime(time.Second), // we don't get the same precision back from the DB
+			cmpopts.EquateEmpty(),
+			cmpopts.SortSlices(func(a, b models.AlertInstance) bool {
+				return a.RuleUID < b.RuleUID
+			}),
+		}
+		require.Empty(t, cmp.Diff(testInstances, savedInstances, opts...))
 	})
 
 	t.Run("Should not fail when the instances are empty", func(t *testing.T) {