Cloudwatch, CloudTrail, X-Ray
A namespace is a container for CloudWatch metrics. Metrics in different namespaces are isolated from each other, so that metrics from different applications are not mistakenly aggregated into the same statistics. There is no default namespace. You must specify a namespace for each data point you publish to CloudWatch. You can specify a namespace name when you create a metric. Metrics are the fundamental concept in CloudWatch. A metric represents a time-ordered set of data points that are published to CloudWatch. Metrics exist only in the Region in which they are created. Metrics cannot be deleted, but they automatically expire after 15 months if no new data is published to them. A dimension is a name/value pair that is part of the identity of a metric. You can assign up to 10 dimensions to a metric. CloudWatch treats each unique combination of dimensions as a separate metric, even if the metrics have the same metric name. Each metric...