getDistributionMetricData method
- required String distributionName,
- required DateTime endTime,
- required DistributionMetricName metricName,
- required int period,
- required DateTime startTime,
- required List<
MetricStatistic> statistics, - required MetricUnit unit,
Returns the data points of a specific metric for an Amazon Lightsail content delivery network (CDN) distribution.
Metrics report the utilization of your resources, and the error counts generated by them. Monitor and collect metric data regularly to maintain the reliability, availability, and performance of your resources.
May throw ServiceException. May throw InvalidInputException. May throw NotFoundException. May throw OperationFailureException. May throw AccessDeniedException. May throw UnauthenticatedException.
Parameter distributionName
:
The name of the distribution for which to get metric data.
Use the GetDistributions
action to get a list of distribution
names that you can specify.
Parameter endTime
:
The end of the time interval for which to get metric data.
Constraints:
- Specified in Coordinated Universal Time (UTC).
-
Specified in the Unix time format.
For example, if you wish to use an end time of October 1, 2018, at 9 PM UTC, specify
1538427600
as the end time.
Parameter metricName
:
The metric for which you want to return information.
Valid distribution metric names are listed below, along with the most
useful statistics
to include in your request, and the
published unit
value.
-
Requests
- The total number of viewer requests received by your Lightsail distribution, for all HTTP methods, and for both HTTP and HTTPS requests.Statistics
: The most useful statistic isSum
.Unit
: The published unit isNone
. -
BytesDownloaded
- The number of bytes downloaded by viewers for GET, HEAD, and OPTIONS requests.Statistics
: The most useful statistic isSum
.Unit
: The published unit isNone
. -
BytesUploaded
- The number of bytes uploaded to your origin by your Lightsail distribution, using POST and PUT requests.Statistics
: The most useful statistic isSum
.Unit
: The published unit isNone
. -
TotalErrorRate
- The percentage of all viewer requests for which the response's HTTP status code was 4xx or 5xx.Statistics
: The most useful statistic isAverage
.Unit
: The published unit isPercent
. -
4xxErrorRate
- The percentage of all viewer requests for which the response's HTTP status cod was 4xx. In these cases, the client or client viewer may have made an error. For example, a status code of 404 (Not Found) means that the client requested an object that could not be found.Statistics
: The most useful statistic isAverage
.Unit
: The published unit isPercent
. -
5xxErrorRate
- The percentage of all viewer requests for which the response's HTTP status code was 5xx. In these cases, the origin server did not satisfy the requests. For example, a status code of 503 (Service Unavailable) means that the origin server is currently unavailable.Statistics
: The most useful statistic isAverage
.Unit
: The published unit isPercent
.
Parameter period
:
The granularity, in seconds, for the metric data points that will be
returned.
Parameter startTime
:
The start of the time interval for which to get metric data.
Constraints:
- Specified in Coordinated Universal Time (UTC).
-
Specified in the Unix time format.
For example, if you wish to use a start time of October 1, 2018, at 8 PM UTC, specify
1538424000
as the start time.
Parameter statistics
:
The statistic for the metric.
The following statistics are available:
-
Minimum
- The lowest value observed during the specified period. Use this value to determine low volumes of activity for your application. -
Maximum
- The highest value observed during the specified period. Use this value to determine high volumes of activity for your application. -
Sum
- All values submitted for the matching metric added together. You can use this statistic to determine the total volume of a metric. -
Average
- The value of Sum / SampleCount during the specified period. By comparing this statistic with the Minimum and Maximum values, you can determine the full scope of a metric and how close the average use is to the Minimum and Maximum values. This comparison helps you to know when to increase or decrease your resources. -
SampleCount
- The count, or number, of data points used for the statistical calculation.
Parameter unit
:
The unit for the metric data request.
Valid units depend on the metric data being requested. For the valid units
with each available metric, see the metricName
parameter.
Implementation
Future<GetDistributionMetricDataResult> getDistributionMetricData({
required String distributionName,
required DateTime endTime,
required DistributionMetricName metricName,
required int period,
required DateTime startTime,
required List<MetricStatistic> statistics,
required MetricUnit unit,
}) async {
ArgumentError.checkNotNull(distributionName, 'distributionName');
ArgumentError.checkNotNull(endTime, 'endTime');
ArgumentError.checkNotNull(metricName, 'metricName');
ArgumentError.checkNotNull(period, 'period');
_s.validateNumRange(
'period',
period,
60,
86400,
isRequired: true,
);
ArgumentError.checkNotNull(startTime, 'startTime');
ArgumentError.checkNotNull(statistics, 'statistics');
ArgumentError.checkNotNull(unit, 'unit');
final headers = <String, String>{
'Content-Type': 'application/x-amz-json-1.1',
'X-Amz-Target': 'Lightsail_20161128.GetDistributionMetricData'
};
final jsonResponse = await _protocol.send(
method: 'POST',
requestUri: '/',
exceptionFnMap: _exceptionFns,
// TODO queryParams
headers: headers,
payload: {
'distributionName': distributionName,
'endTime': unixTimestampToJson(endTime),
'metricName': metricName.toValue(),
'period': period,
'startTime': unixTimestampToJson(startTime),
'statistics': statistics.map((e) => e.toValue()).toList(),
'unit': unit.toValue(),
},
);
return GetDistributionMetricDataResult.fromJson(jsonResponse.body);
}