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Add note for vertex identity federation #715

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Add note for vertex identity federation #715

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6 changes: 6 additions & 0 deletions integrations/llms/vertex-ai.mdx
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Expand Up @@ -75,6 +75,12 @@ Use the Portkey instance to send requests to any models hosted on Vertex AI. You
Vertex AI uses OAuth2 to authenticate its requests, so you need to send the **access token** additionally along with the request.
</Warning>

<Note>
**Self-Hosted GKE Deployments:** When running the Portkey Gateway on GKE with [Workload Identity Federation](/self-hosting/hybrid-deployments/gcp#setting-up-iam-permission) enabled (`GCP_AUTH_MODE=workload`), the Gateway automatically acquires Vertex AI access tokens from the GCP metadata server. No manual `Authorization` header is needed.

The GSA bound to the Gateway's KSA must have the `roles/aiplatform.user` role. See the [GCP deployment guide](/self-hosting/hybrid-deployments/gcp#setting-up-iam-permission) for setup.
</Note>

<Tabs>
<Tab title="NodeJS SDK">
```js
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