AWS Metrics

This page outlines the specific AWS metrics collected by DMC, along with the exact API calls and CloudWatch metrics used during collection. In line with our commitment to transparency, every metric is listed here for your review.

DMC is designed to collect only the data necessary for cloud migration planning, with no PII, no application-level data, and no unnecessary system details. All collected data can be reviewed locally before anything is uploaded, ensuring you retain full visibility and control.

Captured Data Overview¶

Category	Details Captured
Performance Metrics	CPU utilisation, disk throughput and IOPS, network throughput (30-day history via CloudWatch)
Memory	Memory utilisation via CloudWatch agent (if installed); total memory size always captured from EC2 instance type
EC2 Configuration	Instance type, vCPUs, memory, number of disks, network interfaces, boot mode, hypervisor, IP addresses
Disk Configuration	EBS volume device names and sizes
Installed Software	Full application inventory: name, version, vendor (requires guest access)
Network Dependencies	Active connections and listening ports (requires guest access)
SQL Server Instances	Edition, version, instance names, configuration settings (requires guest access)
AWS Resource Inventory	Broader AWS estate across 33 resource types: RDS, S3, EKS, ECS, Lambda, VPC, load balancers, DynamoDB, ElastiCache, SQS, SNS, and more (via AWS Config)
RDS Instances and Clusters	Database engine, version, instance class, storage configuration, multi-AZ status, backup retention, read replicas, encryption, and cluster membership
S3 Buckets	Bucket inventory, storage size by storage class, object count, and access request metrics (GET, PUT, DELETE, LIST)
AWS Cost Data	30-day cost breakdown by service using AWS Cost Explorer: unblended, amortised, and net cost variants plus usage quantity

CloudWatch Metric Inventory¶

Metric	Namespace	Purpose	Access	Requires CloudWatch Agent
`CPUUtilization`	`AWS/EC2`	CPU utilisation over the lookback period	Read	No
`NetworkIn`	`AWS/EC2`	Inbound network throughput	Read	No
`NetworkOut`	`AWS/EC2`	Outbound network throughput	Read	No
`VolumeReadBytes`	`AWS/EBS`	Disk read throughput per EBS volume	Read	No
`VolumeWriteBytes`	`AWS/EBS`	Disk write throughput per EBS volume	Read	No
`VolumeReadOps`	`AWS/EBS`	Read IOPS per EBS volume	Read	No
`VolumeWriteOps`	`AWS/EBS`	Write IOPS per EBS volume	Read	No
`Memory % Committed Bytes In Use`	`CWAgent`	Memory utilisation (Windows)	Read	Yes
`mem_used_percent`	`CWAgent`	Memory utilisation (Linux)	Read	Yes

EC2 API Inventory¶

API Call	Purpose	Access	Dependencies
`DescribeInstances`	Enumerate EC2 instances across all configured regions; captures instance ID, type, platform, state, IP addresses, network interfaces, block device mappings, boot mode, hypervisor, and tags	Read	EC2 API
`DescribeInstanceTypes`	Resolve vCPU count and total memory (MiB) from instance type	Read	EC2 API
`DescribeVolumes`	Retrieve EBS volume sizes and device attachment details	Read	EC2 API
`DescribeRegions`	Enumerate all enabled EC2 regions when no regions are explicitly configured	Read	EC2 API
`GetMetricData`	Retrieve CloudWatch time-series metric data for CPU, memory, disk, and network	Read	CloudWatch API

AWS Resource Inventory¶

API Call	Purpose	Access	Dependencies
`SelectAggregateResourceConfig`	Query AWS Config aggregator for all supported resource types across regions and accounts	Read	AWS Config API
`DescribeConfigurationRecorders`	Verify AWS Config is enabled in each region before querying	Read	AWS Config API
`AssumeRole`	Assume an IAM role to access target accounts during multi-account scans	Execute	STS API
`ListAccounts`	Enumerate active accounts in the AWS Organization for multi-account discovery	Read	Organizations API

RDS API Inventory¶

API Call	Purpose	Access	Dependencies
`DescribeDBInstances`	Enumerate RDS instances; captures engine, version, instance class, storage type, allocated storage, IOPS, multi-AZ, encryption, backup retention, and cluster membership	Read	RDS API
`DescribeDBClusters`	Enumerate Aurora clusters; captures engine, version, storage encryption, deletion protection, engine mode, and serverless scaling configuration	Read	RDS API
`GetMetricData`	Retrieve 30-day CloudWatch performance metrics (CPU, connections, read/write throughput and IOPS, replica lag) for each RDS instance	Read	CloudWatch API

S3 API Inventory¶

API Call	Purpose	Access	Dependencies
`ListBuckets`	Enumerate all S3 buckets in the account	Read	S3 API
`GetBucketLocation`	Resolve the region for each bucket	Read	S3 API
`GetMetricData`	Retrieve storage size (by storage class), object count, and request metrics (GET, PUT, DELETE, LIST, bytes downloaded/uploaded) via CloudWatch	Read	CloudWatch API
`GetBucketEncryption`	Retrieve server-side encryption configuration	Read	S3 API
`GetBucketVersioning`	Retrieve versioning status	Read	S3 API
`GetPublicAccessBlock`	Retrieve public access block configuration	Read	S3 API

Cost Explorer Inventory¶

DMC collects 30 days of cost data to support migration cost analysis and right-sizing recommendations.

Metric	Purpose	Access	Dependencies
`UnblendedCost`	Actual cost for the account at the on-demand rate, without blending across linked accounts	Read	Cost Explorer API
`AmortizedCost`	Cost including the amortised portion of any upfront Reserved Instance or Savings Plan fees	Read	Cost Explorer API
`NetUnblendedCost`	Unblended cost after applying applicable discounts and credits	Read	Cost Explorer API
`NetAmortizedCost`	Amortised cost after applying applicable discounts and credits	Read	Cost Explorer API
`UsageQuantity`	Volume of usage for the billing period (e.g. instance-hours, GB-months)	Read	Cost Explorer API