docs: Prepare Changelog for 8.15.4 (elastic#41574) (elastic#41604)

* docs: Close changelog for 8.15.4

* Update CHANGELOG.asciidoc

---------

Co-authored-by: elasticmachine <elasticmachine@elastic.co>
Co-authored-by: Pierre HILBERT <pierre.hilbert@elastic.co>
(cherry picked from commit 4e683b7)

Co-authored-by: elastic-vault-github-plugin-prod[bot] <150874479+elastic-vault-github-plugin-prod[bot]@users.noreply.github.com>

Author: mergify[bot]

CHANGELOG.asciidoc

@@ -3,6 +3,53 @@
 :issue: https://github.com/elastic/beats/issues/
 :pull: https://github.com/elastic/beats/pull/
 
+[[release-notes-8.15.4]]
+=== Beats version 8.15.4
+https://github.com/elastic/beats/compare/v8.15.3\...v8.15.4[View commits]
+
+==== Breaking changes
+
+*Osquerybeat*
+
+- Disable `allow_unsafe` osquery configuration. {pull}40130[40130]
+
+==== Bugfixes
+
+*Affecting all Beats*
+
+- Fix issue where old data could be saved in the memory queue after acknowledgment, increasing memory use. {pull}41356[41356]
+
+*Filebeat*
+
+- Log bad handshake details when websocket connection fails. {pull}41300[41300]
+- Improve modification time handling for entities and entity deletion logic in the Active Directory entityanalytics input. {pull}41179[41179]
+- Fix double encoding of `client_secret` in the Entity Analytics input's Azure Active Directory provider. {pull}41393[41393]
+- The azure-eventhub input now correctly reports its status to the Elastic Agent on fatal errors. {pull}41469[41469]
+
+*Metricbeat*
+
+- Fix Kubernetes metadata sometimes not being present after startup. {pull}41216[41216]
+
+*Winlogbeat*
+
+- Fix truncated windows event log message. {pull}41327[41327]
+
+==== Added
+
+*Affecting all Beats*
+
+- Replace Ubuntu 20.04 with 24.04 for Docker base images. {issue}40743[40743] {pull}40942[40942]
+- Reduce memory consumption of k8s autodiscovery and the `add_kubernetes_metadata` processor when Deployment metadata is enabled.
+
+*Heartbeat*
+
+- Add monitor status reporter under managed mode. {pull}41077[41077]
+
+*Metricbeat*
+
+- Only watch metadata for ReplicaSets in metricbeat k8s module. {pull}41289[41289]
+
+
 [[release-notes-8.15.3]]
 === Beats version 8.15.3
 https://github.com/elastic/beats/compare/v8.15.2\...v8.15.3[View commits]

CHANGELOG.next.asciidoc

@@ -83,7 +83,6 @@ https://github.com/elastic/beats/compare/v8.8.1\...main[Check the HEAD diff]
 *Winlogbeat*
 
 - Add "event.category" and "event.type" to Sysmon module for EventIDs 8, 9, 19, 20, 27, 28, 255 {pull}35193[35193]
-- Fix truncated windows event log message {pull}41327[41327]
 
 *Functionbeat*
 
@@ -243,6 +242,7 @@ https://github.com/elastic/beats/compare/v8.8.1\...main[Check the HEAD diff]
 - Reduce memory consumption of k8s autodiscovery and the add_kubernetes_metadata processor when Deployment metadata is enabled
 - Add `lowercase` processor. {issue}22254[22254] {pull}41424[41424]
 - Add `uppercase` processor. {issue}22254[22254] {pull}41535[41535]
+
 *Auditbeat*
 
 - Added `add_session_metadata` processor, which enables session viewer on Auditbeat data. {pull}37640[37640]
@@ -447,3 +447,6 @@ https://github.com/elastic/beats/compare/v8.8.1\...main[Check the HEAD diff]
 
 
 
+
+
+

libbeat/docs/release.asciidoc

@@ -8,6 +8,7 @@ This section summarizes the changes in each release. Also read
 <<breaking-changes>> for more detail about changes that affect
 upgrade.
 
+* <<release-notes-8.15.4>>
 * <<release-notes-8.15.3>>
 * <<release-notes-8.15.2>>
 * <<release-notes-8.15.1>>