Remove experimental warning from journald input. (#42107) (#42592)

* Remove experimental warning from journald input.

* Add changelog.

* Mark journald input as Stable.

(cherry picked from commit b4046f9)

Co-authored-by: Craig MacKenzie <[email protected]>
Co-authored-by: Denis <[email protected]>

Author: 3 people

CHANGELOG.next.asciidoc

@@ -402,6 +402,9 @@ https://github.com/elastic/beats/compare/v8.8.1\...main[Check the HEAD diff]
 - Added OAuth2 support with auto token refresh for websocket streaming input. {issue}41989[41989] {pull}42212[42212]
 - Added infinite & blanket retry options to websockets and improved logging and retry logic. {pull}42225[42225]
 - Introduce ignore older and start timestamp filters for AWS S3 input. {pull}41804[41804]
+- Journald input now can report its status to Elastic-Agent {issue}39791[39791] {pull}42462[42462]
+- Publish events progressively in the Okta provider of the Entity Analytics input. {issue}40106[40106] {pull}42567[42567]
+- The journald input is now generally available. {pull}42107[42107]
 
 *Auditbeat*
 

filebeat/docs/inputs/input-journald.asciidoc

@@ -7,8 +7,6 @@
 <titleabbrev>journald</titleabbrev>
 ++++
 
-experimental[]
-
 https://www.freedesktop.org/software/systemd/man/systemd-journald.service.html[`journald`]
 is a system service that collects and stores logging data. The `journald` input
 reads this log data and the metadata associated with it. To read this

filebeat/input/journald/input.go

@@ -73,7 +73,7 @@ const pluginName = "journald"
 func Plugin(log *logp.Logger, store cursor.StateStore) input.Plugin {
 	return input.Plugin{
 		Name:       pluginName,
-		Stability:  feature.Experimental,
+		Stability:  feature.Stable,
 		Deprecated: false,
 		Info:       "journald input",
 		Doc:        "The journald input collects logs from the local journald service",