GetMetricStatistics
Gets statistics for the specified metric.
The maximum number of data points returned from a single call is 1,440. If you request more than 1,440 data points, CloudWatch returns an error. To reduce the number of data points, you can narrow the specified time range and make multiple requests across adjacent time ranges, or you can increase the specified period. Data points are not returned in chronological order.
CloudWatch aggregates data points based on the length of the period that you specify. For example, if you request statistics with a onehour period, CloudWatch aggregates all data points with time stamps that fall within each onehour period. Therefore, the number of values aggregated by CloudWatch is larger than the number of data points returned.
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:

The SampleCount value of the statistic set is 1.

The Min and the Max values of the statistic set are equal.
Percentile statistics are not available for metrics when any of the metric values are negative numbers.
Amazon CloudWatch retains metric data as follows:

Data points with a period of less than 60 seconds are available for 3 hours. These data points are highresolution metrics and are available only for custom metrics that have been defined with a
StorageResolution
of 1. 
Data points with a period of 60 seconds (1minute) are available for 15 days.

Data points with a period of 300 seconds (5minute) are available for 63 days.

Data points with a period of 3600 seconds (1 hour) are available for 455 days (15 months).
Data points that are initially published with a shorter period are aggregated together for longterm storage. For example, if you collect data using a period of 1 minute, the data remains available for 15 days with 1minute resolution. After 15 days, this data is still available, but is aggregated and retrievable only with a resolution of 5 minutes. After 63 days, the data is further aggregated and is available with a resolution of 1 hour.
CloudWatch started retaining 5minute and 1hour metric data as of July 9, 2016.
For information about metrics and dimensions supported by Amazon services, see the Amazon CloudWatch Metrics and Dimensions Reference in the Amazon CloudWatch User Guide.
Request Parameters
For information about the parameters that are common to all actions, see Common Parameters.
 Dimensions.member.N

The dimensions. If the metric contains multiple dimensions, you must include a value for each dimension. CloudWatch treats each unique combination of dimensions as a separate metric. If a specific combination of dimensions was not published, you can't retrieve statistics for it. You must specify the same dimensions that were used when the metrics were created. For an example, see Dimension Combinations in the Amazon CloudWatch User Guide. For more information about specifying dimensions, see Publishing Metrics in the Amazon CloudWatch User Guide.
Type: Array of Dimension objects
Array Members: Maximum number of 30 items.
Required: No
 EndTime

The time stamp that determines the last data point to return.
The value specified is exclusive; results include data points up to the specified time stamp. In a raw HTTP query, the time stamp must be in ISO 8601 UTC format (for example, 20161010T23:00:00Z).
Type: Timestamp
Required: Yes
 ExtendedStatistics.member.N

The percentile statistics. Specify values between p0.0 and p100. When calling
GetMetricStatistics
, you must specify eitherStatistics
orExtendedStatistics
, but not both. Percentile statistics are not available for metrics when any of the metric values are negative numbers.Type: Array of strings
Array Members: Minimum number of 1 item. Maximum number of 10 items.
Required: No
 MetricName

The name of the metric, with or without spaces.
Type: String
Length Constraints: Minimum length of 1. Maximum length of 255.
Required: Yes
 Namespace

The namespace of the metric, with or without spaces.
Type: String
Length Constraints: Minimum length of 1. Maximum length of 255.
Pattern:
[^:].*
Required: Yes
 Period

The granularity, in seconds, of the returned data points. For metrics with regular resolution, a period can be as short as one minute (60 seconds) and must be a multiple of 60. For highresolution metrics that are collected at intervals of less than one minute, the period can be 1, 5, 10, 30, 60, or any multiple of 60. Highresolution metrics are those metrics stored by a
PutMetricData
call that includes aStorageResolution
of 1 second.If the
StartTime
parameter specifies a time stamp that is greater than 3 hours ago, you must specify the period as follows or no data points in that time range is returned:
Start time between 3 hours and 15 days ago  Use a multiple of 60 seconds (1 minute).

Start time between 15 and 63 days ago  Use a multiple of 300 seconds (5 minutes).

Start time greater than 63 days ago  Use a multiple of 3600 seconds (1 hour).
Type: Integer
Valid Range: Minimum value of 1.
Required: Yes

 StartTime

The time stamp that determines the first data point to return. Start times are evaluated relative to the time that CloudWatch receives the request.
The value specified is inclusive; results include data points with the specified time stamp. In a raw HTTP query, the time stamp must be in ISO 8601 UTC format (for example, 20161003T23:00:00Z).
CloudWatch rounds the specified time stamp as follows:

Start time less than 15 days ago  Round down to the nearest whole minute. For example, 12:32:34 is rounded down to 12:32:00.

Start time between 15 and 63 days ago  Round down to the nearest 5minute clock interval. For example, 12:32:34 is rounded down to 12:30:00.

Start time greater than 63 days ago  Round down to the nearest 1hour clock interval. For example, 12:32:34 is rounded down to 12:00:00.
If you set
Period
to 5, 10, or 30, the start time of your request is rounded down to the nearest time that corresponds to even 5, 10, or 30second divisions of a minute. For example, if you make a query at (HH:mm:ss) 01:05:23 for the previous 10second period, the start time of your request is rounded down and you receive data from 01:05:10 to 01:05:20. If you make a query at 15:07:17 for the previous 5 minutes of data, using a period of 5 seconds, you receive data timestamped between 15:02:15 and 15:07:15.Type: Timestamp
Required: Yes

 Statistics.member.N

The metric statistics, other than percentile. For percentile statistics, use
ExtendedStatistics
. When callingGetMetricStatistics
, you must specify eitherStatistics
orExtendedStatistics
, but not both.Type: Array of strings
Array Members: Minimum number of 1 item. Maximum number of 5 items.
Valid Values:
SampleCount  Average  Sum  Minimum  Maximum
Required: No
 Unit

The unit for a given metric. If you omit
Unit
, all data that was collected with any unit is returned, along with the corresponding units that were specified when the data was reported to CloudWatch. If you specify a unit, the operation returns only data that was collected with that unit specified. If you specify a unit that does not match the data collected, the results of the operation are null. CloudWatch does not perform unit conversions.Type: String
Valid Values:
Seconds  Microseconds  Milliseconds  Bytes  Kilobytes  Megabytes  Gigabytes  Terabytes  Bits  Kilobits  Megabits  Gigabits  Terabits  Percent  Count  Bytes/Second  Kilobytes/Second  Megabytes/Second  Gigabytes/Second  Terabytes/Second  Bits/Second  Kilobits/Second  Megabits/Second  Gigabits/Second  Terabits/Second  Count/Second  None
Required: No
Response Elements
The following elements are returned by the service.
 Datapoints.member.N

The data points for the specified metric.
Type: Array of Datapoint objects
 Label

A label for the specified metric.
Type: String
Errors
For information about the errors that are common to all actions, see Common Errors.
 InternalServiceError

Request processing has failed due to some unknown error, exception, or failure.
HTTP Status Code: 500
 InvalidParameterCombination

Parameters were used together that cannot be used together.
HTTP Status Code: 400
 InvalidParameterValue

The value of an input parameter is bad or outofrange.
HTTP Status Code: 400
 MissingParameter

An input parameter that is required is missing.
HTTP Status Code: 400
See Also
For more information about using this API in one of the languagespecific Amazon SDKs, see the following: