Reference: https://cloud.google.com/iam/docs/creating-managing-service-accounts Service Account User (roles/iam.serviceAccountUser): Includes permissions to list service accounts, get details about a service account, and impersonate a service account. Service Account Admin (roles/iam.
serviceAccountAdmin): Includes permissions to list service accounts and get details about a service account.
Also includes permissions to create, update, and delete service accounts, and to view or change the IAM policy on a service account.

https://cloud.google.com/storage/docs/object-versioning

Instance groups are collections of virtual machine (VM) instances that you can manage as a single entity.
Instance groups can help you simplify the management of multiple instances, reduce operational costs, and improve the availability and performance of your applications. Instance groups support autoscaling, which automatically adds or removes instances from the group based on increases or decreases in load. Autoscaling helps your applications gracefully handle increases in traffic and reduces cost when the need for resources is lower. You can set the autoscaling policy based on CPU utilization, load balancing capacity, Cloud Monitoring metrics, or a queue-based workload. In this case, since the video encoding software is CPU-intensive, setting the autoscaling based on CPU utilization is the best option to ensure high availability and optimal performance. References:
* Instance groups
* Autoscaling groups of instances

As mentioned in Schema and data model, you should be careful when choosing a primary key to not accidentally create hotspots in your database. One cause of hotspots is having a column whose value monotonically increases as the first key part, because this results in all inserts occurring at the end of your key space. This pattern is undesirable because Cloud Spanner divides data among servers by key ranges, which means all your inserts will be directed at a single server that will end up doing all the work. https://cloud.
google.com/spanner/docs/schema-design#primary-key-prevent-hotspots

https://cloud.google.com/deployment-manager/docs/configuration/create-basic-configuration