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AWS CloudWatch is built for system operators, site reliability engineers (SRE), IT managers, and developers. It can also recognize, understand and respond to all changes happening throughout the entire system. CloudWatch enables you to set alarms (or alerts), troubleshoot for issues, and discover the insights for application optimization which will ensure that the application runs smooth. There are three alarm states: OK – meaning that the expression or metric is found inside the already defined threshold; ALARM – implies that the alarm is located outside of the specified threshold; INSUFFICIENT_DATA – this alert is shown when the alarm has already started but the metric is not available, or there’s not enough data for the metric to realize in which state the alarm was.
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