Add more details to changelog entry about changes in Beats and Agent …

…logging (#30021)

CHANGELOG.next.asciidoc

@@ -25,9 +25,11 @@ https://github.com/elastic/beats/compare/v7.0.0-alpha2...master[Check the HEAD d
 - Remove several ILM options (`rollover_alias` and `pattern`) as data streams does not require index aliases. {pull}28450[28450]
 - Index template's default_fields setting is only populated with ECS fields. {pull}28596[28596] {issue}28215[28215]
 - Remove deprecated `--template` and `--ilm-policy` flags. Use `--index-management` instead. {pull}28870[28870]
-- Remove options `logging.files.suffix` and default to datetime endings. {pull}28927[28927]
+- Remove options `logging.files.suffix` and default to datetime endings in log file names. The format of the new name is `{beatname}-{date}(-n)?.ndjson`. Exmaple log files names from oldest to newest: `filebeat-20200101.ndjson`, `filebeat-20200101-1.ndjson`, `filebeat-20200101-2.ndjson`. {pull}28927[28927]
+- Remove Journalbeat. Use `journald` input of Filebeat instead. {pull}29131[29131]
 - `include_matches` option of `journald` input no longer accepts a list of string. {pull}29294[29294]
 - Allign kubernetes configuration settings. {pull}29908[29908]
+- The extension of the log files of Beats and Elastic Agent is changed to `.ndjson`. If you are collecting the logs, you must change the path configuration to `/path/to/logs/{beatname}*.ndjson` to avoid any issues. {pull}28927[28927]
 - Remove legacy support for SSLv3. {pull}30071[30071]
 - `add_fields` processor is now able to set metadata in events {pull}30092[30092]