Subject: RAG Engine Service Returning 503 UNAVAILABLE

Google Cloud Build with AI Agents
, , ,
1

The RAG Engine Service in Google Cloud Platform is currently unavailable for the following project:

  • RAG Engine Corpus Region: europe-west2
  • Vertex AI Client Region: europe-west2

The RAG Engine Service was working as expected until two days ago. However, starting yesterday, all query attempts have consistently failed during the response-generation phase with a 503 UNAVAILABLE error.

Observed Error:

503 UNAVAILABLE
{
  'error': {
    'code': 503,
    'message': 'The service is currently unavailable.',
    'status': 'UNAVAILABLE'
  }
}

Additional Details:

  • The issue is occurring consistently across query attempts.
  • The RAG Engine Corpus is configured in the europe-west2 region.
  • The initialized Vertex AI client and RAG corpus share the same project ID and region (europe-west2).
  • No intentional configuration or regional changes were made immediately before the issue started.

Request:

I am unsure whether there is an ongoing service-side issue, regional outage, capacity limitation, or any recent change affecting the RAG Engine Service in europe-west2 for the gcp project?

Please advise if any configuration changes or remediation steps are required from our side to restore the service.

Impact:

The RAG Engine functionality is currently blocked, as every query fails during response generation with the 503 UNAVAILABLE error.