add changelog

CHANGELOG.next.asciidoc

@@ -94,6 +94,7 @@ https://github.com/elastic/beats/compare/v8.8.1\...main[Check the HEAD diff]
 - Fix cache processor expiries infinite growth when large a large TTL is used and recurring keys are cached. {pull}38561[38561]
 - Fix parsing of RFC 3164 process IDs in syslog processor. {issue}38947[38947] {pull}38982[38982]
 - Rename the field "apache2.module.error" to "apache.module.error" in Apache error visualization. {issue}39480[39480] {pull}39481[39481]
+- Add the Offset property to libbeat/reader.Message to store the total number of bytes read and discarded before generating the message. This enables inputs to accurately determine how much data has been read up to the message, using Message.Bytes + Message.Offset. {pull}39873[39873] {issue}39653[39653]
 
 *Auditbeat*
 
@@ -142,6 +143,7 @@ https://github.com/elastic/beats/compare/v8.8.1\...main[Check the HEAD diff]
 - Fix concurrency/error handling bugs in the AWS S3 input that could drop data and prevent ingestion of large buckets. {pull}39131[39131]
 - Fix EntraID query handling. {issue}39419[39419] {pull}39420[39420]
 - Fix request trace filename handling in http_endpoint input. {pull}39410[39410]
+- Fix filestream not correctly tracking the offset of a file when using the `include_message` parsser. {pull}39873[39873] {issue}39653[39653]
 
 *Heartbeat*