[#1283] Clear systemd-notify status on exit

Signed-off-by: Aleksey Savchuk <a.savchuk@yadro.com>

cmd/frostfs-ir/main.go

@@ -13,6 +13,7 @@ import (
 	"git.frostfs.info/TrueCloudLab/frostfs-node/misc"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/innerring"
 	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util/logger"
+	"git.frostfs.info/TrueCloudLab/frostfs-node/pkg/util/sdnotify"
 	"github.com/spf13/viper"
 	"go.uber.org/zap"
 )
@@ -124,4 +125,8 @@ func shutdown() {
 			zap.String("error", err.Error()),
 		)
 	}
+
+	if err := sdnotify.ClearStatus(); err != nil {
+		log.Error(logs.FailedToReportStatusToSystemd, zap.Error(err))
+	}
 }

cmd/frostfs-node/config.go

@@ -1398,4 +1398,8 @@ func (c *cfg) shutdown() {
 	for i := range c.closers {
 		c.closers[len(c.closers)-1-i].fn()
 	}
+
+	if err := sdnotify.ClearStatus(); err != nil {
+		c.log.Error(logs.FailedToReportStatusToSystemd, zap.Error(err))
+	}
 }

pkg/util/sdnotify/sdnotify.go

@@ -69,6 +69,11 @@ func Status(status string) error {
 	return Send("STATUS=" + status)
 }
 
+// ClearStatus resets the current service status previously set by Status.
+func ClearStatus() error {
+	return Status("")
+}
+
 // Send state through the notify socket if any.
 // If the notify socket was not detected, it returns an error.
 func Send(state string) error {