Add Fleet & Agent 9.0.1 Release Notes (#1345)

Adds the 9.0.1 Release Notes:

Fleet contents from: elastic/kibana#219734
No new Fleet Server content in: [Changelog
file](https://github.com/elastic/fleet-server/tree/8b2747cc87df45b54c2522c706beed3bc60c4bae/changelog/fragments)
Elastic Agent contents from:
elastic/elastic-agent#8066

---

**Release Notes**

<img width="599" alt="rn"
src="https://github.com/user-attachments/assets/c69dc70f-8d6a-4e71-8b99-5c2b042a1f23"
/>



**Breaking change:**

<img width="605" alt="rn-break"
src="https://github.com/user-attachments/assets/ff177f0b-5e9e-4fe3-8e4c-81406bec7d91"
/>

Author: kilfoyle

release-notes/fleet-elastic-agent/breaking-changes.md

@@ -16,6 +16,16 @@ Breaking changes can impact your Elastic applications, potentially disrupting no
 % **Action**<br> Steps for mitigating deprecation impact.
 % ::::
 
+## 9.0.1 [fleet-elastic-agent-9.0.1-breaking-changes]
+
+::::{dropdown} Disabled the `process` scraper of the `hostmetrics` receiver in the Elastic Distribution of OTel Collector
+
+**Impact**<br>
+This scraper collects metrics for all available processes of a host without an easy way to limit this to only report top N process for example. This results in quite big amount of timeseries. Since this is not quite critical for any of the available UIs or dashboards we decide to disable it temporarily until we find a better solution. Users that specifically need these metrics can also enable it back manually.
+
+For more information, check [#198434]({{agent-pull}}7894).
+::::
+
 ## 9.0.0 [fleet-elastic-agent-900-breaking-changes]
 
 ::::{dropdown} Removed deprecated epm Fleet APIs

release-notes/fleet-elastic-agent/index.md

@@ -23,6 +23,17 @@ To check for security updates, go to [Security announcements for the Elastic sta
 % ### Fixes [fleet-elastic-agent-next-fixes]
 % *
 
+## 9.0.1 [fleet-elastic-agent-9.0.1-release-notes]
+
+### Features and enhancements [fleet-elastic-agent-9.0.1-features-enhancements]
+
+* Reuse shared integration policies when duplicating {{agent}} policies in {{fleet}} [#217872](https://github.com/elastic/kibana/pull/217872)
+* Update OTel components to v0.121.0 [#7686]({{agent-pull}}7686)
+* Add nopexporter to Elastic Distribution of OTel Collector (EDOT) Collector [#7788]({{agent-pull}}7788)
+* In {{agent}}, use `fullnameOverride` to set the fully qualified application names in the EDOT Kube-Stack Helm chart. [#7754]({{agent-pull}}7754) [#7381]({{agent-issue}}7381)
+
+### Fixes [fleet-elastic-agent-9.0.1-fixes]
+* In the EDOT Collector, fix Managed OTLP Helm config to use the current image repository [#7882]({{agent-pull}}7882)
 
 ## 9.0.0 [fleet-elastic-agent-900-release-notes]