Creating or upgrading a cluster by specifying the version as latest does not provide automatic upgrades.
Enable node auto-upgrades to ensure that the nodes in your cluster are up-to-date with the latest stable version.
https://cloud.google.com/kubernetes-engine/versioning-and-upgrades
Node auto-upgrades help you keep the nodes in your cluster up to date with the cluster master version when your master is updated on your behalf. When you create a new cluster or node pool with Google Cloud Console or the gcloud command, node auto-upgrade is enabled by default.
Ref: https://cloud.google.com/kubernetes-engine/docs/how-to/node-auto-upgrades

Explanation/Reference: https://cloud.google.com/sdk/docs/authorizing

This aligns with Googles recommended practices. By creating a new project, we achieve complete isolation between development and production environments; as well as isolate this production application from production applications of other departments.
Ref: https://cloud.google.com/docs/enterprise/best-practices-for-enterprise-organizations#define-hierarchy

https://cloud.google.com/iam/docs/job-functions/auditing#scenario_external_auditors Because if you directly add users to the IAM roles, then if any users left the organization then you have to remove the users from multiple places and need to revoke his/her access from multiple places. But, if you put a user into a group then its very easy to manage these type of situations. Now, if any user left then you just need to remove the user from the group and all the access got revoked 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. Data is redacted using Cloud DLP before being made accessible for viewing via the dashboard application. The table below explains IAM logging roles that an Organization Administrator can grant to the service account used by the dashboard, as well as the resource level at which the role is granted.