Alerting: Add option for memberlist label (#67982)

pkg/setting/setting_unified_alerting.go

@@ -71,6 +71,7 @@ type UnifiedAlertingSettings struct {
 	HAPeerTimeout                  time.Duration
 	HAGossipInterval               time.Duration
 	HAPushPullInterval             time.Duration
+	HALabel                        string
 	HARedisAddr                    string
 	HARedisPeerName                string
 	HARedisPrefix                  string
@@ -230,6 +231,7 @@ func (cfg *Cfg) ReadUnifiedAlertingSettings(iniFile *ini.File) error {
 	}
 	uaCfg.HAListenAddr = ua.Key("ha_listen_address").MustString(alertmanagerDefaultClusterAddr)
 	uaCfg.HAAdvertiseAddr = ua.Key("ha_advertise_address").MustString("")
+	uaCfg.HALabel = ua.Key("ha_label").MustString("")
 	uaCfg.HARedisAddr = ua.Key("ha_redis_address").MustString("")
 	uaCfg.HARedisPeerName = ua.Key("ha_redis_peer_name").MustString("")
 	uaCfg.HARedisPrefix = ua.Key("ha_redis_prefix").MustString("")