Create a Pub/Sub topic for log aggregation. Write a custom Python script on a Cloud Function Leverage the Cloud Logging API to periodically pull logs from Google Cloud and forward the logs to the SIEM. Schedule the Cloud Function to run twice per day.

Deploy a Cloud Logging sink with a filter that routes all logs directly to a syslog endpoint. The endpoint is based on a single Compute Engine hosted on Google Cloud that routes all logs to the on-premises SIEM. Implement a Cloud Function that triggers a retry action in case of failure.

Utilize custom firewall rules to allow your SIEM to directly query Google Cloud logs. Implement a Cloud Function that notifies the SIEM of a failed delivery and triggers a retry action.