You can use the GetMetricData
API to retrieve as many as 100 different
metrics in a single request, with a total of as many as 100,800
datapoints. You can also optionally perform math expressions on the
values of the returned statistics, to create new time series that
represent new insights into your data. For example, using Lambda
metrics, you could divide the Errors metric by the Invocations metric to
get an error rate time series. For more information about metric math
expressions, see Metric Math Syntax and Functions
in the Amazon CloudWatch User Guide.
cloudwatch_get_metric_data(MetricDataQueries, StartTime, EndTime,
NextToken, ScanBy, MaxDatapoints)
[required] The metric queries to be returned. A single GetMetricData
call can
include as many as 100 MetricDataQuery
structures. Each of these
structures can specify either a metric to retrieve, or a math expression
to perform on retrieved data.
[required] The time stamp indicating the earliest data to be returned.
For better performance, specify StartTime
and EndTime
values that
align with the value of the metric's Period
and sync up with the
beginning and end of an hour. For example, if the Period
of a metric
is 5 minutes, specifying 12:05 or 12:30 as StartTime
can get a faster
response from CloudWatch than setting 12:07 or 12:29 as the StartTime
.
[required] The time stamp indicating the latest data to be returned.
For better performance, specify StartTime
and EndTime
values that
align with the value of the metric's Period
and sync up with the
beginning and end of an hour. For example, if the Period
of a metric
is 5 minutes, specifying 12:05 or 12:30 as EndTime
can get a faster
response from CloudWatch than setting 12:07 or 12:29 as the EndTime
.
Include this value, if it was returned by the previous call, to get the next set of data points.
The order in which data points should be returned. TimestampDescending
returns the newest data first and paginates when the MaxDatapoints
limit is reached. TimestampAscending
returns the oldest data first and
paginates when the MaxDatapoints
limit is reached.
The maximum number of data points the request should return before paginating. If you omit this, the default of 100,800 is used.
svc$get_metric_data( MetricDataQueries = list( list( Id = "string", MetricStat = list( Metric = list( Namespace = "string", MetricName = "string", Dimensions = list( list( Name = "string", Value = "string" ) ) ), Period = 123, Stat = "string", Unit = "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" ), Expression = "string", Label = "string", ReturnData = TRUE|FALSE ) ), StartTime = as.POSIXct( "2015-01-01" ), EndTime = as.POSIXct( "2015-01-01" ), NextToken = "string", ScanBy = "TimestampDescending"|"TimestampAscending", MaxDatapoints = 123 )
Calls to the GetMetricData
API have a different pricing structure than
calls to GetMetricStatistics
. For more information about pricing, see
Amazon CloudWatch Pricing.
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 high-resolution 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 (1-minute) are available for 15 days.
Data points with a period of 300 seconds (5-minute) 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 long-term storage. For example, if you collect data using a period of 1 minute, the data remains available for 15 days with 1-minute 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.