Changelog for 8.19.4 (#5506)

Author: pierrehilbert

changelog/8.19.4.yaml

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+version: 8.19.4
+entries:
+    - kind: bug-fix
+      summary: Restore connection limiter
+      description: |
+        Restore connection level limiter to prevent OOM incidents.
+        This limiter is used in addition to the request-level throttle so that once
+        our in-flight requests reaches max_connections a 429 is returned, but if the
+        total connections the server uses is over max_connections*1.1 the server drops
+        the connection before the TLS handshake.
+      component: fleet-server
+      pr:
+        - https://github.com/elastic/fleet-server/pull/5372
+      issue: []
+      impact: ""
+      action: ""
+      timestamp: 1756409821
+      file:
+        name: 1756409821-Restore-connection-limiter.yaml
+        checksum: 7ae8e8521ecea4ac5d8944328b4ffcc51c1a609b
+    - kind: bug-fix
+      summary: Build fleet-server as fully static binary to restore OS matrix compatibility
+      description: ""
+      component: fleet-server
+      pr:
+        - https://github.com/elastic/fleet-server/pull/5392
+      issue:
+        - https://github.com/elastic/fleet-server/issues/5262
+      impact: ""
+      action: ""
+      timestamp: 1756940128
+      file:
+        name: 1756940128-fix-binary-compilation.yaml
+        checksum: 7d4f89d7775d01ca5c63dd022364a5eec262cae0

changelog/8.19.4/breaking.md

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+## 8.19.4 [-8.19.4-breaking-changes]
+
+_No breaking changes._

changelog/8.19.4/deprecations.md

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+## 8.19.4 [-8.19.4-deprecations]
+
+_No deprecations._

changelog/8.19.4/index.md

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+## 8.19.4 [-release-notes-8.19.4]
+
+
+
+
+### Fixes [-8.19.4-fixes]
+
+* Restore connection limiter. [#5372](https://github.com/elastic/fleet-server/pull/5372) 
+
+  Restore connection level limiter to prevent OOM incidents.
+  This limiter is used in addition to the request-level throttle so that once
+  our in-flight requests reaches max_connections a 429 is returned, but if the
+  total connections the server uses is over max_connections*1.1 the server drops
+  the connection before the TLS handshake.
+  
+* Build fleet-server as fully static binary to restore OS matrix compatibility. [#5392](https://github.com/elastic/fleet-server/pull/5392) [#5262](https://github.com/elastic/fleet-server/issues/5262)
+