extendedStatistic
The extended statistic for the metric specified in MetricName. When you call PutMetricAlarm and specify a MetricName, you must specify either Statistic or ExtendedStatistic but not both.
If you specify ExtendedStatistic, the following are valid values:
p90tm90tc90ts90wm90IQMPR(<i>n</i>:<i>m</i>)where n and m are values of the metricTC(<i>X</i>%:<i>X</i>%)where X is between 10 and 90 inclusive.TM(<i>X</i>%:<i>X</i>%)where X is between 10 and 90 inclusive.TS(<i>X</i>%:<i>X</i>%)where X is between 10 and 90 inclusive.WM(<i>X</i>%:<i>X</i>%)where X is between 10 and 90 inclusive.
For more information about these extended statistics, see CloudWatch statistics definitions.