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Update CloudWatch section with high-resolution metrics and alarms (#507)
* Update CloudWatch section with high-resolution metrics and alarms * Fix typo, add 'new' emoji
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@ -870,7 +870,9 @@ CloudWatch
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* 🔸Metrics in CloudWatch originate [on the hypervisor](https://forums.aws.amazon.com/message.jspa?messageID=403578). The hypervisor doesn't have access to OS information, so certain metrics (most notably memory utilization) are not available unless pushed to CloudWatch from inside the instance.
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* 🔸Metrics in CloudWatch originate [on the hypervisor](https://forums.aws.amazon.com/message.jspa?messageID=403578). The hypervisor doesn't have access to OS information, so certain metrics (most notably memory utilization) are not available unless pushed to CloudWatch from inside the instance.
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* 🔸You can not use [more than one metric for an alarm](https://forums.aws.amazon.com/thread.jspa?threadID=94984).
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* 🔸You can not use [more than one metric for an alarm](https://forums.aws.amazon.com/thread.jspa?threadID=94984).
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* 🔸Notifications you receive from alarms will not have any contextual detail; they have only the specifics of the threshold, alarm state, and timing.
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* 🔸Notifications you receive from alarms will not have any contextual detail; they have only the specifics of the threshold, alarm state, and timing.
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* 🔸Minimum granularity in CloudWatch is 1 minute. That means that multiple values of a metric that are pushed to CloudWatch within the same minute are aggregated into minimum, maximum, average and total (sum) per minute.
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* 🔸By default, CloudWatch metric resolution is 1 minute. If you send multiple values of a metric within the same minute, they will be aggregated into minimum, maximum, average and total (sum) per minute.
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* 🐥In July 2017, a new [high-resolution option](http://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/publishingMetrics.html#high-resolution-metrics) was added for CloudWatch metrics and alarms. This feature allows you to record metrics with 1-second resolution, and to evaluate CloudWatch alarms every 10 seconds.
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- The [blog post introducing this feature](https://aws.amazon.com/blogs/aws/new-high-resolution-custom-metrics-and-alarms-for-amazon-cloudwatch/) describes how to publish a high-resolution metric to CloudWatch. Note that when calling the `PutMetricData` API, `StorageResolution` is an attribute of each item you send in the `MetricData` array, not a direct parameter of the `PutMetricData` API call.
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* 🔸Data about metrics is kept in CloudWatch [for 15 months](https://aws.amazon.com/blogs/aws/amazon-cloudwatch-update-extended-metrics-retention-user-interface-update/), starting November 2016 (used to be 14 days). Minimum granularity increases after 15 days.
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* 🔸Data about metrics is kept in CloudWatch [for 15 months](https://aws.amazon.com/blogs/aws/amazon-cloudwatch-update-extended-metrics-retention-user-interface-update/), starting November 2016 (used to be 14 days). Minimum granularity increases after 15 days.
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AMIs
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AMIs
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