Amazon ECS cluster utilization metrics
The cluster utilization metrics are available for CPU, memory, and, when there is an EBS volume attached to your tasks, EBS filesystem utilization. These metrics are only available for clusters with tasks or services hosted on Amazon EC2 instances. They're not supported on clusters with tasks hosted on Amazon Fargate.
Amazon ECS cluster level CPU and memory utilization metrics
The CPU and memory utilization is measured as the percentage of CPU and memory
that is used by all tasks on a cluster when compared to the aggregate CPU and memory
that was registered for each active Amazon EC2 instances registered to the cluster. Only
Amazon EC2 instances in ACTIVE or DRAINING status will affect
cluster utilization metrics.
(Total CPU units used by tasks in cluster) x 100
Cluster CPU utilization = --------------------------------------------------------------
(Total CPU units registered by container instances in cluster) (Total MiB of memory used by tasks in cluster x 100)
Cluster memory utilization = ------------------------------------------------------------------
(Total MiB of memory registered by container instances in cluster)Each minute, the Amazon ECS container agent on each Amazon EC2 instance calculates the number of CPU units and MiB of memory that is currently being used for each task that is running on that Amazon EC2 instance, and this information is reported back to Amazon ECS. The total amount of CPU and memory used for all tasks running on the cluster is calculated, and those numbers are reported to CloudWatch as a percentage of the total registered resources for the cluster.
For example, a cluster has two active Amazon EC2 instances registered, a
c4.4xlarge instance and a c4.large instance. The
c4.4xlarge instance registers into the cluster with
16,384 CPU units and 30,158 MiB of memory. The
c4.large instance registers with 2,048 CPU units and
3,768 MiB of memory. The aggregate resources of this cluster are
18,432 CPU units and 33,926 MiB of memory.
If ten tasks are running on this cluster and each task consumes 1,024
CPU units and 2,048 MiB of memory, a total of 10,240 CPU
units and 20,480 MiB of memory are used on the cluster. This is
reported to CloudWatch as 55% CPU utilization and 60% memory utilization for the
cluster.
Amazon ECS cluster-level Amazon EBS filesystem utilization
The cluster level EBS filesystem utilization metric is measured as the total amount of the EBS filesystem in use by the tasks running on the cluster, divided by the total amount of EBS filesystem storage that was allocated for all of the tasks in the cluster.
(Total GB of EBS filesystem used by tasks in cluster x 100)
Cluster EBS filesystem utilization = ---------------------------------------------------------------
(Total GB of EBS filesystem allocated to tasks in cluster)