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cloudwatch &RDS M8 P3 (cloudwatch (Metric (aggregate metric (per…
cloudwatch &RDS M8 P3
cloudwatch
cloudwatch event pt ?
, Amazon EC2 generates an event when the state of an EC2 instance changes from pending to running, and Amazon EC2 Auto Scaling generates events when it launches or terminates instances
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Metric
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aggregate metric
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Using composite alarms can help you reduce alarm noise. If you set up a composite alarm to notify you of state changes, but set up the underlying metric alarms to not send notifications themselves, you will be notified only when the alarm state of the composite alarm changes. For example, you could create metric alarms based on both CPU utilization and disk read operations, and specify for these alarms to never take actions. You could then create a composite alarm that goes into ALARM state and notifies you only when both of those metric alarms are in ALARM state.
Currently, the only alarm actions that can be taken by composite alarms are notifying SNS topic
status (Demo)
Insufficient data?
has just started, the metric is not available
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log
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can filter, send notification, query
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Event example
In our scenario, an organization deploys an application to a large number of computers. The application deploys a health-checking component along with the application to each computer, which in turn sends application health reports to a central location. The organization wants to monitor all instances of the deployed application and its availability in near real time. As a result, the health-checking component reports one of three color-coded health statuses about the application:
Green: The application is healthy, so no action is required.
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Red: The application might have failed on at least one computer because it passed the threshold of failed health checks. Notify the operations team.
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