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>
(cherry picked from commit 7826ef6)

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: "",