Alerting: Reduce set of fields that could trigger alert state change (#83496)

We want to avoid too much change of alert state based on change on
alert's fields. For that we ignore some fields from the diff.

pkg/services/ngalert/schedule/registry.go

@@ -300,9 +300,7 @@ func (r ruleWithFolder) Fingerprint() fingerprint {
 	// TODO consider removing fields below from the fingerprint
 	writeInt(rule.ID)
 	writeInt(rule.OrgID)
-	writeInt(rule.IntervalSeconds)
 	writeInt(int64(rule.For))
-	writeLabels(rule.Annotations)
 	if rule.DashboardUID != nil {
 		writeString(*rule.DashboardUID)
 	}

pkg/services/ngalert/schedule/registry_test.go

@@ -150,10 +150,13 @@ func TestRuleWithFolderFingerprint(t *testing.T) {
 		f2 := ruleWithFolder{rule: rule, folderTitle: uuid.NewString()}.Fingerprint()
 		require.NotEqual(t, f, f2)
 	})
-	t.Run("Version and Updated should be excluded from fingerprint", func(t *testing.T) {
+	t.Run("Version, Updated, IntervalSeconds and Annotations should be excluded from fingerprint", func(t *testing.T) {
 		cp := models.CopyRule(rule)
 		cp.Version++
 		cp.Updated = cp.Updated.Add(1 * time.Second)
+		cp.IntervalSeconds++
+		cp.Annotations = make(map[string]string)
+		cp.Annotations["test"] = "test"
 
 		f2 := ruleWithFolder{rule: cp, folderTitle: title}.Fingerprint()
 		require.Equal(t, f, f2)
@@ -242,6 +245,8 @@ func TestRuleWithFolderFingerprint(t *testing.T) {
 		excludedFields := map[string]struct{}{
 			"Version":         {},
 			"Updated":         {},
+			"IntervalSeconds": {},
+			"Annotations":     {},
 		}
 
 		tp := reflect.TypeOf(rule).Elem()