AWS CloudWatch Alarm Not Triggering for ECS Task CPU Utilization Despite Correct Metric Configuration
I'm a bit lost with I'm sure I'm missing something obvious here, but I'm trying to debug Does anyone know how to I tried several approaches but none seem to work... I'm stuck on something that should probably be simple. I'm currently facing an issue where my AWS CloudWatch Alarm for an ECS task's CPU utilization is not triggering as expected. I've configured the alarm to monitor the `CPUUtilization` metric for my ECS service, but it doesn't seem to react even when the CPU usage exceeds the threshold I've set. Specifically, I've set the alarm to trigger when the average CPU utilization exceeds 80% for a period of 5 minutes. I’ve verified that the ECS service is indeed utilizing more than 80% CPU during peak loads. Here’s the CloudWatch Alarm configuration I used: ```json { "AlarmName": "High CPU Utilization", "MetricName": "CPUUtilization", "Namespace": "AWS/ECS", "Statistic": "Average", "Period": 300, "EvaluationPeriods": 1, "Threshold": 80, "ComparisonOperator": "GreaterThanThreshold", "ActionsEnabled": true, "AlarmActions": ["arn:aws:sns:us-east-1:123456789012:my-sns-topic"], "Dimensions": [ { "Name": "ClusterName", "Value": "my-cluster" }, { "Name": "ServiceName", "Value": "my-service" } ] } ``` I also ensured that my ECS service is running in the correct cluster and has the right IAM permissions to publish metrics to CloudWatch. I’ve checked the CloudWatch logs and can see the CPU metrics coming in correctly, but the alarm status remains `INSUFFICIENT_DATA` even when I can visually confirm the CPU utilization hits above the threshold. I've tried deleting and recreating the alarm, and also double-checked the metric's namespace and dimensions to ensure they match the ECS service's configuration. I even manually tested the SNS notification by sending a test message to ensure that it works. Could anyone provide insight into what might be causing the alarm not to trigger or any common pitfalls to look out for? For context: I'm using Json on Ubuntu. This is part of a larger service I'm building. Thanks in advance! Any ideas what could be causing this? I'm working with Json in a Docker container on Windows 11. What are your experiences with this? I'm working in a Windows 10 environment. This is happening in both development and production on macOS. This is happening in both development and production on Debian. Is there a better approach? I'm working with Json in a Docker container on CentOS. Thanks for taking the time to read this!