Event-triggered tasks of the system monitoring type use scaling-group-level metrics to determine when to scale. The metric value is the average across all instances in the scaling group and updates automatically as instances are added or removed.
This topic lists the metrics supported for each resource type (ECS instances, Elastic Container Instances, and ALB backend servers), along with each metric's unit, statistical period, and network requirements.
ECS metrics
The following tables list the metrics available for Elastic Compute Service (ECS) instances.
Metrics collected from ECS instances
| Metric (Auto Scaling console) | Metric (Auto Scaling API) | Unit | Statistical period | Supported network |
|---|---|---|---|---|
| (ECS) CPU Utilization | CpuUtilization |
% | 15 seconds, 1 minute, 2 minutes, 5 minutes, 15 minutes | VPC and classic network |
| (ECS) ECS Concurrent Connections | ConcurrentConnections |
Item | 15 seconds, 1 minute, 2 minutes, 5 minutes, 15 minutes | VPC and classic network |
| (ECS) Internal Network Outbound Traffic | IntranetTx |
Kb/min | 15 seconds, 1 minute, 2 minutes, 5 minutes, 15 minutes | VPC and classic network |
| (ECS) Internal Network Inbound Traffic | IntranetRx |
Kb/min | 15 seconds, 1 minute, 2 minutes, 5 minutes, 15 minutes | VPC and classic network |
| (ECS) Public Network Outbound Traffic | VpcInternetTx |
Kb/min | 15 seconds, 1 minute, 2 minutes, 5 minutes, 15 minutes | VPC and classic network |
| (ECS) Public Network Inbound Traffic | VpcInternetRx |
Kb/min | 15 seconds, 1 minute, 2 minutes, 5 minutes, 15 minutes | VPC and classic network |
| (ECS) System Disk Read (BPS) | SystemDiskReadBps |
Byte/s | 15 seconds, 1 minute, 2 minutes, 5 minutes, 15 minutes | VPC and classic network |
| (ECS) System Disk Write (BPS) | SystemDiskWriteBps |
Byte/s | 15 seconds, 1 minute, 2 minutes, 5 minutes, 15 minutes | VPC and classic network |
| (ECS) System Disk Read (IOPS) | SystemDiskReadOps |
requests per second | 15 seconds, 1 minute, 2 minutes, 5 minutes, 15 minutes | VPC and classic network |
| (ECS) System Disk Write (IOPS) | SystemDiskWriteOps |
times per second | 15 seconds, 1 minute, 2 minutes, 5 minutes, 15 minutes | VPC and classic network |
Metrics collected from CloudMonitor (agent-based)
These metrics require the CloudMonitor agent to be installed on each instance. When you select CloudMonitor as the collection source, Auto Scaling installs the agent on all instances in the scaling group. To make sure new instances are also covered, enable Automatically Install CloudMonitor Agent on Newly Purchased ECS Instances in the CloudMonitor console.
| Metric (Auto Scaling console) | Metric (Auto Scaling API) | Unit | Statistical period | Supported network |
|---|---|---|---|---|
| (Agent) CPU Utilization | CpuUtilizationAgent |
% | 15 seconds, 1 minute, 2 minutes, 5 minutes, 15 minutes | VPC and classic network |
| (Agent) GPU Utilization | GpuUtilizationAgent |
% | 15 seconds, 1 minute, 2 minutes, 5 minutes, 15 minutes | VPC and classic network |
| (Agent) Idle GPU Memory Percentage | GpuMemoryFreeUtilizationAgent |
% | 15 seconds, 1 minute, 2 minutes, 5 minutes, 15 minutes | VPC and classic network |
| (Agent) GPU Memory Usage | GpuMemoryUtilizationAgent |
% | 15 seconds, 1 minute, 2 minutes, 5 minutes, 15 minutes | VPC and classic network |
| (Agent) Memory | MemoryUtilization |
% | 15 seconds, 1 minute, 2 minutes, 5 minutes, 15 minutes | VPC and classic network |
| (Agent) Average System Load | LoadAverage |
None | 15 seconds, 1 minute, 2 minutes, 5 minutes, 15 minutes | VPC and classic network |
| (Agent) Total TCP Connections | TcpConnection |
Item | 15 seconds, 1 minute, 2 minutes, 5 minutes, 15 minutes | VPC and classic network |
| (Agent) Established TCP Connections | TcpConnection |
Item | 15 seconds, 1 minute, 2 minutes, 5 minutes, 15 minutes | VPC and classic network |
| (Agent) Internal Network Packets Sent | PackagesNetOut |
Count/s | 15 seconds, 1 minute, 2 minutes, 5 minutes, 15 minutes | VPC and classic network |
| (Agent) Internal Network Packets Received | PackagesNetIn |
Count/s | 15 seconds, 1 minute, 2 minutes, 5 minutes, 15 minutes | VPC and classic network |
| (Agent) Public Network Packets Sent | PackagesNetOut |
Count/s | 15 seconds, 1 minute, 2 minutes, 5 minutes, 15 minutes | Classic network |
| (Agent) Public Network Packets Received | PackagesNetIn |
Count/s | 15 seconds, 1 minute, 2 minutes, 5 minutes, 15 minutes | Classic network |
To use GPU metrics, install GPU drivers on your GPU-accelerated instances first. For instructions, see Installation guideline for NVIDIA drivers.
Elastic Container Instance metrics
The following table lists the metrics available for Elastic Container Instances. All ECI metrics are collected via CloudMonitor and support only Virtual Private Cloud (VPC) networks. The 15-second statistical period is not available for ECI metrics.
| Metric (Auto Scaling console) | Metric (Auto Scaling API) | Unit | Statistical period | Supported network |
|---|---|---|---|---|
| CPU Utilization | EciPodCpuUtilization |
% | 1 minute, 2 minutes, 5 minutes, 15 minutes | VPC |
| Memory | EciPodMemoryUtilization |
% | 1 minute, 2 minutes, 5 minutes, 15 minutes | VPC |
ALB metrics
If your scaling group (ECS type or Elastic Container Instance type) is associated with an Application Load Balancer (ALB) instance, use the (ALB) QPS per Backend Server metric to trigger scaling based on request load.
| Metric (Auto Scaling console) | Metric (Auto Scaling API) | Unit | Statistical period | Supported network |
|---|---|---|---|---|
| (ALB) QPS per Backend Server | LoadBalancerRealServerAverageQps |
Count/s | 15 seconds, 1 minute, 2 minutes, 5 minutes, 15 minutes | VPC |
The 15-second statistical period is available only for scaling groups of the ECS type.
Usage notes
CloudMonitor agent requirement
Agent-based ECS metrics (prefixed with "Agent") require the CloudMonitor agent on every instance.
GPU metrics requirement
GPU metrics (GpuUtilizationAgent, GpuMemoryFreeUtilizationAgent, GpuMemoryUtilizationAgent) are only available on GPU-accelerated instances with GPU drivers installed.
Classic network support
All ECS and agent-based metrics support both VPC and classic network; ECI and ALB metrics support VPC only.