Storage
Compute
VM
AWS EC2 and GCP Cloud Compute.
Containers
Logs
API logs
AWS Cloudtrail, GCP Cloud Audit Logs. These logs usually go to dedicated storage (S3 for AWS or Cloud Storage for GCP). AWS logs are in json, GCP in protocol buffer format. GCP also streams the logs to Stackdriver Logging, while AWS - to Cloudwatch.
Monitoring
AWS Cloudwatch
Firewall
AWS and GCP: VPC flow logs
Threat Detection
AWS GuardDuty
Config Changes
AWS Config, GCP Cloud Asset Inventory.
You can track configurations of various resources here, compute instances, storage, roles, lambda functions etc.
In AWS, go to AWS Config -> Resources -> Choose the resource of interest (you may want to filter by type) -> Resource Timeline. This feature can be turned on and off for a resource, and the retention period can also be adjusted.
Encryption
At-rest
In-transit
Security
IAM
Firewall
AWS Security Groups, GCP