Publishes metric data points to Amazon CloudWatch. CloudWatch associates the data points with the specified metric. If the specified metric does not exist, CloudWatch creates the metric. When CloudWatch creates a metric, it can take up to fifteen minutes for the metric to appear in calls to ListMetrics.
You can publish either individual data points in the
Value field, or
arrays of values and the number of times each value occurred during the period by using the
Counts fields in the
MetricDatum structure. Using
Counts method enables you to publish up to 150 values per metric
PutMetricData request, and
supports retrieving percentile statistics on this data.
PutMetricData request is limited to 40 KB in size for HTTP POST requests. You can
send a payload compressed by gzip. Each request
is also limited to no more than 20 different metrics.
Value parameter accepts numbers of type
Double, CloudWatch rejects values that are either too small
or too large. Values must be in the range of -2^360 to 2^360. In addition, special values (for example, NaN, +Infinity,
-Infinity) are not supported.
You can use up to 10 dimensions per metric to further clarify what data the metric collects. Each dimension consists of a Name and Value pair. For more information about specifying dimensions, see Publishing Metrics in the Amazon CloudWatch User Guide.
You specify the time stamp to be associated with each data point. You can specify time stamps that are as much as two weeks before the current date, and as much as 2 hours after the current day and time.
Data points with time stamps from 24 hours ago or longer can take at least 48 hours to become available for GetMetricData or GetMetricStatistics from the time they are submitted. Data points with time stamps between 3 and 24 hours ago can take as much as 2 hours to become available for for GetMetricData or GetMetricStatistics.
CloudWatch needs raw data points to calculate percentile statistics. If you publish data using a statistic set instead, you can only retrieve percentile statistics for this data if one of the following conditions is true:
SampleCount value of the statistic set is 1 and
Sum are all equal.
Max are equal, and
Sum is equal to