CHANGELOG/v0.448.0.md
**New services:**
- a2c
**New actions:**
- rum:BatchCreateRumMetricDefinitions
- rum:BatchDeleteRumMetricDefinitions
- rum:BatchGetRumMetricDefinitions
- rum:DeleteRumMetricsDestination
- rum:ListRumMetricsDestinations
- rum:PutRumMetricsDestination
- rum:UpdateRumMetricDefinition
- sagemaker-groundtruth-synthetic:GetAccountDetails