Treat session ID as a string in system/users (elastic#22359)

* treat session ID as a string

* add changelog

* Update wording on CHANGELOG.next.asciidoc

Co-authored-by: kaiyan-sheng <kaiyan.sheng@elastic.co>

Co-authored-by: kaiyan-sheng <kaiyan.sheng@elastic.co>

CHANGELOG.next.asciidoc

@@ -390,6 +390,7 @@ https://github.com/elastic/beats/compare/v7.0.0-alpha2...master[Check the HEAD d
 - Fix instance name in perfmon metricset. {issue}22218[22218] {pull}22261[22261]
 - Remove io.time from windows {pull}22237[22237]
 - Add interval information to `monitor` metricset in azure. {pull}22152[22152]
+- Change Session ID type from int to string {pull}22359[22359]
 
 *Packetbeat*
 
@@ -843,4 +844,3 @@ https://github.com/elastic/beats/compare/v7.0.0-alpha2...master[Check the HEAD d
 *Journalbeat*
 
 
-

metricbeat/module/system/users/dbus.go

@@ -48,7 +48,7 @@ type sessionInfo struct {
 
 // loginSession contains basic information on a login session
 type loginSession struct {
-	ID   uint64
+	ID   string
 	UID  uint32
 	User string
 	Seat string
@@ -167,16 +167,11 @@ func formatSessionList(props [][]dbus.Variant) ([]loginSession, error) {
 		if len(session) < 5 {
 			return nil, fmt.Errorf("wrong number of fields in session: %v", session)
 		}
-		idStr, ok := session[0].Value().(string)
+		id, ok := session[0].Value().(string)
 		if !ok {
 			return nil, fmt.Errorf("failed to cast user ID to string")
 		}
 
-		id, err := strconv.ParseUint(idStr, 10, 32)
-		if err != nil {
-			return nil, errors.Wrap(err, "error parsing ID to int")
-		}
-
 		uid, ok := session[1].Value().(uint32)
 		if !ok {
 			return nil, fmt.Errorf("failed to cast session uid to uint32")

metricbeat/module/system/users/users_test.go

@@ -61,7 +61,7 @@ func TestFormatSessionList(t *testing.T) {
 	}
 
 	goodOut := []loginSession{{
-		ID:   uint64(6),
+		ID:   "6",
 		UID:  uint32(1000),
 		User: "user",
 		Seat: "",