add changelog

fix race using the same list from 2 goroutines
2026-05-17 08:36:55 +03:00 · 2025-02-10 14:37:16 +08:00 · 2025-02-10 14:37:15 +08:00
2 changed files with 3 additions and 1 deletions
--- a/app/vmalert/notifier/alertmanager.go
+++ b/app/vmalert/notifier/alertmanager.go
@@ -70,7 +70,7 @@ func (am *AlertManager) Send(ctx context.Context, alerts []Alert, headers map[st

 func (am *AlertManager) send(ctx context.Context, alerts []Alert, headers map[string]string) error {
 	b := &bytes.Buffer{}
-	alertsToSend := alerts[:0]
+	alertsToSend := make([]Alert, 0, len(alerts))
 	lblss := make([][]prompbmarshal.Label, 0, len(alerts))
 	for _, a := range alerts {
 		lbls := a.applyRelabelingIfNeeded(am.relabelConfigs)
--- a/docs/changelog/CHANGELOG.md
+++ b/docs/changelog/CHANGELOG.md
@@ -20,6 +20,8 @@ See also [LTS releases](https://docs.victoriametrics.com/lts-releases/).

 * SECURITY: upgrade Go builder from Go1.23.5 to Go1.23.6. See the list of issues addressed in [Go1.23.6](https://github.com/golang/go/issues?q=milestone%3AGo1.23.6+label%3ACherryPickApproved).

+* BUGFIX: [vmalert](https://docs.victoriametrics.com/vmalert/): fix polluted alert messages when multiple Alertmanager instances are configured as notifiers with alert_relabel_configs.. See [this issue](https://github.com/VictoriaMetrics/VictoriaMetrics/issues/8040), and thanks to @evkuzin for [the pull request](https://github.com/VictoriaMetrics/VictoriaMetrics/pull/8258).
+
 ## [v1.111.0](https://github.com/VictoriaMetrics/VictoriaMetrics/releases/tag/v1.111.0)

 Released at 2025-02-07
Author	SHA1	Message	Date
Haley Wang	06ad07e446	add changelog	2025-02-10 14:37:16 +08:00
Evgeny Kuzin	b8bad032d4	fix race using the same list from 2 goroutines	2025-02-10 14:37:15 +08:00