``To comply with this requirement, a dashboard is available that provides access to the historic logs stored in BigQuery, and on request, to the Cloud Logging Admin Activity logs.
The organization creates a Google group for these external auditors and adds the current auditor to the group. This group is monitored and is typically granted access to the dashboard application.
During normal access, the auditors' Google group is only granted access to view the historic logs stored in BigQuery. If any anomalies are discovered, the group is granted permission to view the actual Cloud Logging Admin Activity logs via the dashboard's elevated access mode. At the end of each audit period, the group's access is then revoked.''
https://cloud.google.com/iam/docs/job-functions/auditing#scenario_external_auditors