add changelog and improve messages

CHANGELOG.next.asciidoc

@@ -164,6 +164,7 @@ https:/elastic/beats/compare/v8.8.1\...main[Check the HEAD diff]
 - Fixed failed job handling and removed false-positive error logs in the GCS input. {pull}41142[41142]
 - Bump github.com/elastic/go-sfdc dependency used by x-pack/filebeat/input/salesforce. {pull}41192[41192]
 - Log bad handshake details when websocket connection fails {pull}41300[41300]
+- Journald input now can read events from all boots {issue}41083[41083] {pull}41244[41244]
 
 *Heartbeat*
 

filebeat/input/journald/pkg/journalctl/reader.go

@@ -96,7 +96,8 @@ type Reader struct {
  // the journalctl process
  jctlLogger *logp.Logger
 
- // args are arguments for journalctl that never change
+ // args are arguments for journalctl that never change,
+ // like the message filters, format, etc
  args []string
 
  // firstRunArgs are the arguments used in the first call to
@@ -359,7 +360,7 @@ func (r *Reader) handleMessage(msg []byte) (JournalEntry, error) {
  "look at the events log file for the raw journal event")
 
  // Log raw data to events log file
- msg := fmt.Sprintf("data cannot be parsed as map[string]any JSON: '%s'",
+ msg := fmt.Sprintf("data cannot be parsed as map[string]any. Data: '%s'",
  string(msg))
  r.logger.Errorw(
  msg,