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* However, this total can include no more than one composite alarm. For example, you could
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* delete 99 metric alarms and one composite alarms with one operation, but you can't
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* delete two composite alarms with one operation.</p>
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* <p> If you specify an incorrect alarm name or make any other error in the operation,
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* no alarms are deleted. To confirm that alarms were deleted successfully, you can use the
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* <p> If you specify any incorrect alarm names, the alarms you specify with correct names are still deleted. Other syntax errors might result
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* in no alarms being deleted. To confirm that alarms were deleted successfully, you can use the
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* <a href="https://docs.aws.amazon.com/AmazonCloudWatch/latest/APIReference/API_DescribeAlarms.html">DescribeAlarms</a> operation after using <code>DeleteAlarms</code>.</p>
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* <note>
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* <p>It is possible to create a loop or cycle of composite alarms, where composite
* <p>Displays whether the rule is evaluated on the transformed versions of logs, for log groups
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* that have <a href="https://docs.aws.amazon.com/AmazonCloudWatch/latest/logs/CloudWatch-Logs-Transformation.html">Log transformation</a> enabled. If this is <code>false</code>, log events are evaluated before they are transformed.</p>
* <p>Specify <code>true</code> to have this rule evalute log events after they have been transformed by
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* <a href="https://docs.aws.amazon.com/AmazonCloudWatch/latest/logs/CloudWatch-Logs-Transformation.html">Log transformation</a>. If you specify <code>true</code>, then the log events in log groups that have transformers will
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* be evaluated by Contributor Insights after being transformed. Log groups that don't have
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* transformers will still have their original log events evaluated by Contributor Insights.</p>
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* <p>The default is <code>false</code>
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* </p>
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* <note>
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* <p>If a log group has a transformer, and transformation fails for some log events, those log events won't be evaluated by
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* Contributor Insights. For information about investigating log transformation failures, see
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* <a href="https://docs.aws.amazon.com/AmazonCloudWatch/latest/logs/Transformation-Errors-Metrics.html">Transformation metrics and errors</a>.</p>
* <p>The length, in seconds, used each time the metric specified in
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* <code>MetricName</code> is evaluated. Valid values are 10, 30, and any multiple of
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* <code>MetricName</code> is evaluated. Valid values are 10, 20, 30, and any multiple of
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* 60.</p>
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* <p>
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* <code>Period</code> is required for alarms based on static thresholds. If you are
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* creating an alarm based on a metric math expression, you specify the period for each
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* metric within the objects in the <code>Metrics</code> array.</p>
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* <p>Be sure to specify 10 or 30 only for metrics that are stored by a
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* <p>Be sure to specify 10, 20, or 30 only for metrics that are stored by a
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* <code>PutMetricData</code> call with a <code>StorageResolution</code> of 1. If you
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* specify a period of 10 or 30 for a metric that does not have sub-minute resolution, the
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* specify a period of 10, 20, or 30 for a metric that does not have sub-minute resolution, the
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* alarm still attempts to gather data at the period rate that you specify. In this case,
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* it does not receive data for the attempts that do not correspond to a one-minute data
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* resolution, and the alarm might often lapse into INSUFFICENT_DATA status. Specifying 10
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* resolution, and the alarm might often lapse into INSUFFICENT_DATA status. Specifying 10, 20,
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* or 30 also sets this alarm as a high-resolution alarm, which has a higher charge than
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* other alarms. For more information about pricing, see <a href="https://aws.amazon.com/cloudwatch/pricing/">Amazon CloudWatch
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* Pricing</a>.</p>
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* <p>An alarm's total current evaluation period can be no longer than one day, so
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* <code>Period</code> multiplied by <code>EvaluationPeriods</code> cannot be more than
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* 86,400 seconds.</p>
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* <p>An alarm's total current evaluation period can be no longer than seven days, so
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* <code>Period</code> multiplied by <code>EvaluationPeriods</code> can't be more than
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* 604,800 seconds. For alarms with a period of less than one hour (3,600 seconds), the total evaluation period can't be longer than one day (86,400 seconds).</p>
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