AWS documentation states cloudwatch shares metrics every one minute, is it possible to get the metrics checked every 10 secs or less than a minute? If an instance goes down and I have to wait a full 1 minute to know that it is down? To spin up a new one in its place?
can cloudwatch send metrics in less than 1 min?
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I presume that you are referring to Amazon EC2 metrics that are collected by Amazon CloudWatch.
No, you cannot configure these metrics to be collected more often. By default, Amazon EC2 metrics are collected every five minutes. You can activate detailed monitoring to obtain the metrics every one minute.
However, Elastic Load Balancing health checks can check the health of an instance more often, and it will only send traffic to instances that are responding correctly to health checks.
Amazon EC2 Auto Scaling can be configured to use Elastic Load Balancing health checks to determine the health of instances. If an instance is identified as unhealthy, Auto Scaling will automatically replace the instance. However, this can take several minutes to be identified and have a new instance operational. Thus, it is recommended to always be running a minimum of two instances.