[AIG] Update changelog (#17114)

* Added new changelog

* Update ai-gateway.yaml

* Update src/content/changelogs/ai-gateway.yaml

Co-authored-by: Jun Lee <[email protected]>

---------

Co-authored-by: Kathy <[email protected]>
Co-authored-by: Jun Lee <[email protected]>

Author: 3 people

src/content/changelogs/ai-gateway.yaml

@@ -5,10 +5,31 @@ productLink: "/ai-gateway/"
 productArea: Developer platform
 productAreaLink: /workers/platform/changelog/platform/
 entries:
+  - publish_date: "2024-09-26"
+    title: Persistent logs
+    description: |-
+      * **Logs**: AI Gateway now has [logs that persist](/ai-gateway/observability/logging/index), giving you the flexibility to store them for your preferred duration.
+
+  - publish_date: "2024-09-26"
+    title: Logpush
+    description: |-
+      * **Logs**: Securely export logs to an external storage location using [Logpush](/ai-gateway/observability/logging/logpush).
+
+  - publish_date: "2024-09-26"
+    title: Pricing
+    description: |-
+      * **Pricing**: Added [pricing](/ai-gateway/pricing/) for storing logs persistently.
+
+  - publish_date: "2024-09-26"
+    title: Evaluations
+    description: |-
+      * **Configurations**: Use AI Gateway’s [Evaluations](/ai-gateway/observability/evaluations/index.mdx) to make informed decisions on how to optimize your AI application.
+
   - publish_date: "2024-09-10"
     title: Custom costs
     description: |-
       * **Configuration**: AI Gateway now allows you to set custom costs at the request level [custom costs](/ai-gateway/configuration/custom-costs/) to requests, accurately reflect your unique pricing, overriding the default or public model costs.
+
   - publish_date: "2024-08-02"
     title: Mistral AI
     description: |-