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[8.10] Move 8.9.0 RN host.name change to breaking changes section (backport #464) #466

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Sep 7, 2023
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[8.10] Move 8.9.0 RN host.name change to breaking changes section (backport #464) #466

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14 changes: 13 additions & 1 deletion docs/en/ingest-management/release-notes/release-notes-8.9.asciidoc
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Original file line number Diff line number Diff line change
Expand Up @@ -125,6 +125,19 @@ Now, any unexpected error returns an `Internal Server Error` response while keep
unchanged. On expected failure paths (for example, Agent Inactive, Missing Agent ID, Missing Auth Header) a `Bad Request` response is returned. For more information, refer to {fleet-server-pull}2531[#2531].
====

[discrete]
[[breaking-ecs-hostname]]
.`host.name` field changed to ECS lowercase format.
[%collapsible]
====
*Details* +
In {agent} output the `host.name` field has been changed to lowercase to match Elastic Common Schema (ECS) guidelines. The agent name is also reported in lowercase (`AGENT-name` becomes `agent-name`).

*Impact* +
After upgrading {agent} to version 8.9.0 or higher, any case-sensitive searches may result in false-positive alerts. For example, a case-sensitive search based on the upper-case `AGENT-name` could result in an alert such as `system.load.1 reported no data in the last 5m for AGENT-name`. After upgrading, you may need to manually clear alerts and adjust some searches to match the new `host.name` format.

====

[discrete]
[[new-features-8.9.0]]
=== New features
Expand Down Expand Up @@ -158,7 +171,6 @@ The 8.9.0 release Added the following new and notable features.

{agent}::
* Add additional elements to support the Universal Profiling integration. {agent-pull}2881[#2881]
* Lowercase reported hostnames per Elastic Common Schema (Ecs) Guidelines for the `host.name` field.

[discrete]
[[bug-fixes-8.9.0]]
Expand Down