changelog: add fleet ingest pipeline breaking change (#12556)

* changelog: add fleet ingest pipeline breaking change See elastic/kibana#175254 Part of #12498
elastic · Feb 5, 2024 · 6ed334a · 6ed334a
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diff --git a/changelogs/8.12.asciidoc b/changelogs/8.12.asciidoc
@@ -13,6 +13,7 @@ https://github.com/elastic/apm-server/compare/v8.11.4\...v8.12.0[View commits]
 ==== Breaking Changes
 - The unsupported apm_data_stream_migration ingest pipeline has been removed {pull}12102[12102].
 - "publish_ready" is always false in the "GET /" response until events are received by apm-server {pull}12150[12150]
+- A bug has been introduced, so that `traces-apm@custom` ingest pipeline is now additionally applied to data streams `traces-apm.sampled-*` and `traces-apm.rum-*` and applied twice for `traces-apm-*`. See more details and information around a fix in the Known Issues section.
 
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 ==== Bug fixes