Cherry-pick #22359 to 7.x: Treat session ID as a string in system/users

CHANGELOG.next.asciidoc

@@ -432,6 +432,7 @@ field. You can revert this change by configuring tags for the module and omittin
 - Revert change to report `process.memory.rss` as `process.memory.wss` on Windows. {pull}22055[22055]
 - Add interval information to `monitor` metricset in azure. {pull}22152[22152]
 - Remove io.time from windows {pull}22237[22237]
+- Change Session ID type from int to string {pull}22359[22359]
 
 *Packetbeat*
 
@@ -925,3 +926,5 @@ field. You can revert this change by configuring tags for the module and omittin
 ==== Known Issue
 
 *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: "",