<p>您引用的统计信息是使用<a href="https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/cloudwatch.html#CloudWatch.Client.get_metric_statistics" rel="nofollow noreferrer">get_metric_statistics</a>获得的。但是,要获得实际数据点,您应该查看<a href="https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/cloudwatch.html#CloudWatch.Client.get_metric_data" rel="nofollow noreferrer">get_metric_data</a>:</p>
<blockquote>
<p>You can use the GetMetricData API to retrieve as many as 500 different metrics in a single request, with a total of <strong>as many as 100,800 data points</strong>.</p>
</blockquote>
<p>但应该注意的是,数据点越老,分辨率越低。AWS不存储所有点。只有“新”数据将以原始分辨率存储</p>
<blockquote>
<p>Data points that are initially published with a shorter period are aggregated together for long-term storage. For example, if you collect data using a period of 1 minute, the data remains available for <strong>15 days</strong> with 1-minute resolution. After 15 days, this data is still available, but is <strong>aggregated</strong> and retrievable only with a resolution of 5 minutes.</p>
</blockquote>
<h3>聚合更新</h3>
<p>也来自<a href="https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/publishingMetrics.html" rel="nofollow noreferrer">docs</a>:</p>
<blockquote>
<p>Although you can publish data points with time stamps as granular as one-thousandth of a second, CloudWatch <strong>aggregates the data to a minimum granularity of 1 second</strong>.</p>
</blockquote>