从 CloudWatch 获取最新指标

Question

I'm trying to obtain a custom CloudWatch metric. I don't know up front how often it reports, so I have two problems: what start time do I use and what period to specify. Is there any way to just get the latest recorded metric, maybe within the last hour or day? Ideally I don't want to return excessive data points just to discard all but the latest and also don't want to have my period be too large and combine multiple metrics into one or too small and maybe not have data.

Answer 1

CloudWatch metrics can have one of two resolutions:

1. Standard resolution, with data having a one-minute granularity.
2. High resolution, with data at a granularity of one second .

When you publish a custom metric, you can define it as either standard resolution or high resolution. You can read more about this here.

It's up to you to configure how to send your custom metric data to CloudWatch. A good resource can be found here .

You can install and use a CloudWatch Agent to record your custom metrics, or go the route of making your own script to call the AWS CloudWatch service with the CLI. From a billing perspective, there is no penalty for sending too much custom metric data to the CloudWatch service. You can find out more about the CloudWatch pricing scheme here, but I suspect what you're doing will incur a negligible cost.

Answer 2

This might be a little late but I had the same problem. As it looks like, the GetMetricDataCommand has a MaxDatapoints parameter which might help you:

const command = new GetMetricDataCommand({
    StartTime: new Date(new Date().setDate(today.getDate() - 30)),
    EndTime: new Date(),
    MetricDataQueries: [/* put your queries here */],
    MaxDatapoints: 1
});