From dd4a33adff0d7c317c1aab2dbe3db650393c368b Mon Sep 17 00:00:00 2001
From: Vadim Stepanov <vstpme@gmail.com>
Date: Tue, 10 Jun 2025 15:21:44 +0100
Subject: [PATCH] [release-11.5.6] Alerting: Provisioning API returns 403 on
 quota exceeded for rule group PUT (#106486)

Alerting: Provisioning API returns 403 on quota exceeded for rule group PUT (#106409)

(cherry picked from commit 1df888c51778ad3c02497d98d521435d990516ea)
---
 pkg/services/ngalert/api/api_provisioning.go  |  3 +++
 .../ngalert/api/api_provisioning_test.go      | 20 +++++++++++++++++++
 2 files changed, 23 insertions(+)

diff --git a/pkg/services/ngalert/api/api_provisioning.go b/pkg/services/ngalert/api/api_provisioning.go
index cdbe810597b..85a8ebdfb0f 100644
--- a/pkg/services/ngalert/api/api_provisioning.go
+++ b/pkg/services/ngalert/api/api_provisioning.go
@@ -519,6 +519,9 @@ func (srv *ProvisioningSrv) RoutePutAlertRuleGroup(c *contextmodel.ReqContext, a
 	if errors.Is(err, store.ErrOptimisticLock) {
 		return ErrResp(http.StatusConflict, err, "")
 	}
+	if errors.Is(err, alerting_models.ErrQuotaReached) {
+		return ErrResp(http.StatusForbidden, err, "")
+	}
 	if err != nil {
 		return response.ErrOrFallback(http.StatusInternalServerError, "", err)
 	}
diff --git a/pkg/services/ngalert/api/api_provisioning_test.go b/pkg/services/ngalert/api/api_provisioning_test.go
index 6246e6e0e6f..decf0f8c80e 100644
--- a/pkg/services/ngalert/api/api_provisioning_test.go
+++ b/pkg/services/ngalert/api/api_provisioning_test.go
@@ -657,6 +657,26 @@ func TestProvisioningApi(t *testing.T) {
 		})
 	})
 
+	t.Run("have reached the rule quota, PUT returns 403", func(t *testing.T) {
+		env := createTestEnv(t, testConfig)
+		quotas := provisioning.MockQuotaChecker{}
+		quotas.EXPECT().LimitExceeded()
+		env.quotas = &quotas
+		sut := createProvisioningSrvSutFromEnv(t, &env)
+		group := definitions.AlertRuleGroup{
+			Title:    "test rule group",
+			Interval: 60,
+			Rules: []definitions.ProvisionedAlertRule{
+				createTestAlertRule("test-alert-rule", 1),
+			},
+		}
+		rc := createTestRequestCtx()
+
+		response := sut.RoutePutAlertRuleGroup(&rc, group, "folder-uid", group.Title)
+
+		require.Equal(t, 403, response.Status())
+	})
+
 	t.Run("exports", func(t *testing.T) {
 		t.Run("alert rule group", func(t *testing.T) {
 			t.Run("are present, GET returns 200", func(t *testing.T) {