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Class: Aws::CloudWatch::Metric

Inherits:
Resources::Resource show all
Defined in:
(unknown)

Instance Attribute Summary collapse

Attributes inherited from Resources::Resource

#client, #identifiers

Instance Method Summary collapse

Methods inherited from Resources::Resource

add_data_attribute, add_identifier, #data, data_attributes, #data_loaded?, identifiers, #load, #wait_until

Methods included from Resources::OperationMethods

#add_batch_operation, #add_operation, #batch_operation, #batch_operation_names, #batch_operations, #operation, #operation_names, #operations

Constructor Details

#initialize(namespace, name, options = {}) ⇒ Object #initialize(options = {}) ⇒ Object

Overloads:

  • #initialize(namespace, name, options = {}) ⇒ Object

    Parameters:

    • namespace (String)
    • name (String)

    Options Hash (options):

    • :client (Client)

      When `:client is not given, the options hash is used to construct a new Client object.

  • #initialize(options = {}) ⇒ Object

    Options Hash (options):

    • :namespace (required, String)
    • :name (required, String)
    • :client (Client)

      When `:client is not given, the options hash is used to construct a new Client object.

Instance Attribute Details

#dimensionsArray<Types::Dimension> (readonly)

The dimensions for the metric.

Returns:

#metric_nameString (readonly)

The name of the metric.

Returns:

  • (String)

    The name of the metric.

#nameString (readonly)

Returns:

  • (String)

#namespaceString (readonly)

Returns:

  • (String)

Instance Method Details

#alarms(options = {}) ⇒ Collection<Alarm>

Returns a Collection of Alarm resources. No API requests are made until you call an enumerable method on the collection. Client#describe_alarms_for_metric will be called multiple times until every Alarm has been yielded.

Examples:

Request syntax example with placeholder values


metric.alarms({
  statistic: "SampleCount", # accepts SampleCount, Average, Sum, Minimum, Maximum
  extended_statistic: "ExtendedStatistic",
  dimensions: [
    {
      name: "DimensionName", # required
      value: "DimensionValue", # required
    },
  ],
  period: 1,
  unit: "Seconds", # accepts 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
})

Enumerating Alarm resources.

metric.alarms.each do |alarm|
  # yields each alarm
end

Enumerating Alarm resources with a limit.

metric.alarms.limit(10).each do |alarm|
  # yields at most 10 alarms
end

Batch operations callable on the returned collection


# calls Client#delete_alarms on each batch
metric.alarms.batch_delete!

# calls Client#disable_alarm_actions on each batch
metric.alarms.batch_disable_actions

# calls Client#enable_alarm_actions on each batch
metric.alarms.batch_enable_actions

Options Hash (options):

  • :statistic (String)

    The statistic for the metric, other than percentiles. For percentile statistics, use ExtendedStatistics.

  • :extended_statistic (String)

    The percentile statistic for the metric. Specify a value between p0.0 and p100.

  • :dimensions (Array<Types::Dimension>)

    The dimensions associated with the metric. If the metric has any associated dimensions, you must specify them in order for the call to succeed.

  • :period (Integer)

    The period, in seconds, over which the statistic is applied.

  • :unit (String)

    The unit for the metric.

Returns:

See Also:

#get_statistics(options = {}) ⇒ Types::GetMetricStatisticsOutput

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 one-hour period, CloudWatch aggregates all data points with time stamps that fall within each one-hour 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.

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.

CloudWatch started retaining 5-minute and 1-hour metric data as of July 9, 2016.

For information about metrics and dimensions supported by AWS services, see the Amazon CloudWatch Metrics and Dimensions Reference in the Amazon CloudWatch User Guide.

Examples:

Request syntax example with placeholder values


metric.get_statistics({
  dimensions: [
    {
      name: "DimensionName", # required
      value: "DimensionValue", # required
    },
  ],
  start_time: Time.now, # required
  end_time: Time.now, # required
  period: 1, # required
  statistics: ["SampleCount"], # accepts SampleCount, Average, Sum, Minimum, Maximum
  extended_statistics: ["ExtendedStatistic"],
  unit: "Seconds", # accepts 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
})

Options Hash (options):

  • :dimensions (Array<Types::Dimension>)

    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.

  • :start_time (required, Time)

    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. The time stamp must be in ISO 8601 UTC format (for example, 2016-10-03T23:00:00Z).

    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 5-minute 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 1-hour 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 30-second divisions of a minute. For example, if you make a query at (HH:mm:ss) 01:05:23 for the previous 10-second 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.

  • :end_time (required, Time)

    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. The time stamp must be in ISO 8601 UTC format (for example, 2016-10-10T23:00:00Z).

  • :period (required, Integer)

    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 high-resolution 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. High-resolution metrics are those metrics stored by a PutMetricData call that includes a StorageResolution 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).

  • :statistics (Array<String>)

    The metric statistics, other than percentile. For percentile statistics, use ExtendedStatistics. When calling GetMetricStatistics, you must specify either Statistics or ExtendedStatistics, but not both.

  • :extended_statistics (Array<String>)

    The percentile statistics. Specify values between p0.0 and p100. When calling GetMetricStatistics, you must specify either Statistics or ExtendedStatistics, but not both.

  • :unit (String)

    The unit for a given metric. Metrics may be reported in multiple units. Not supplying a unit results in all units being returned. If the metric only ever reports one unit, specifying a unit has no effect.

Returns:

See Also:

#put_alarm(options = {}) ⇒ Alarm

Examples:

Request syntax example with placeholder values


metric.put_alarm({
  alarm_name: "AlarmName", # required
  alarm_description: "AlarmDescription",
  actions_enabled: false,
  ok_actions: ["ResourceName"],
  alarm_actions: ["ResourceName"],
  insufficient_data_actions: ["ResourceName"],
  statistic: "SampleCount", # accepts SampleCount, Average, Sum, Minimum, Maximum
  extended_statistic: "ExtendedStatistic",
  dimensions: [
    {
      name: "DimensionName", # required
      value: "DimensionValue", # required
    },
  ],
  period: 1, # required
  unit: "Seconds", # accepts 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
  evaluation_periods: 1, # required
  datapoints_to_alarm: 1,
  threshold: 1.0, # required
  comparison_operator: "GreaterThanOrEqualToThreshold", # required, accepts GreaterThanOrEqualToThreshold, GreaterThanThreshold, LessThanThreshold, LessThanOrEqualToThreshold
  treat_missing_data: "TreatMissingData",
  evaluate_low_sample_count_percentile: "EvaluateLowSampleCountPercentile",
})

Basic usage

alarm = metric.put_alarm(options)
alarm.name
#=> "alarm-name"

Options Hash (options):

  • :alarm_name (required, String)

    The name for the alarm. This name must be unique within the AWS account.

  • :alarm_description (String)

    The description for the alarm.

  • :actions_enabled (Boolean)

    Indicates whether actions should be executed during any changes to the alarm state.

  • :ok_actions (Array<String>)

    The actions to execute when this alarm transitions to an OK state from any other state. Each action is specified as an Amazon Resource Name (ARN).

    Valid Values: arn:aws:automate:region:ec2:stop | arn:aws:automate:region:ec2:terminate | arn:aws:automate:region:ec2:recover | arn:aws:sns:region:account-id:sns-topic-name | arn:aws:autoscaling:region:account-id:scalingPolicy:policy-id autoScalingGroupName/group-friendly-name:policyName/policy-friendly-name

    Valid Values (for use with IAM roles): arn:aws:swf:region:`<em>account-id</em>`:action/actions/AWS_EC2.InstanceId.Stop/1.0 | arn:aws:swf:region:`<em>account-id</em>`:action/actions/AWS_EC2.InstanceId.Terminate/1.0 | arn:aws:swf:region:`<em>account-id</em>`:action/actions/AWS_EC2.InstanceId.Reboot/1.0

  • :alarm_actions (Array<String>)

    The actions to execute when this alarm transitions to the ALARM state from any other state. Each action is specified as an Amazon Resource Name (ARN).

    Valid Values: arn:aws:automate:region:ec2:stop | arn:aws:automate:region:ec2:terminate | arn:aws:automate:region:ec2:recover | arn:aws:sns:region:account-id:sns-topic-name | arn:aws:autoscaling:region:account-id:scalingPolicy:policy-id autoScalingGroupName/group-friendly-name:policyName/policy-friendly-name

    Valid Values (for use with IAM roles): arn:aws:swf:region:`<em>account-id</em>`:action/actions/AWS_EC2.InstanceId.Stop/1.0 | arn:aws:swf:region:`<em>account-id</em>`:action/actions/AWS_EC2.InstanceId.Terminate/1.0 | arn:aws:swf:region:`<em>account-id</em>`:action/actions/AWS_EC2.InstanceId.Reboot/1.0

  • :insufficient_data_actions (Array<String>)

    The actions to execute when this alarm transitions to the INSUFFICIENT_DATA state from any other state. Each action is specified as an Amazon Resource Name (ARN).

    Valid Values: arn:aws:automate:region:ec2:stop | arn:aws:automate:region:ec2:terminate | arn:aws:automate:region:ec2:recover | arn:aws:sns:region:account-id:sns-topic-name | arn:aws:autoscaling:region:account-id:scalingPolicy:policy-id autoScalingGroupName/group-friendly-name:policyName/policy-friendly-name

    Valid Values (for use with IAM roles): arn:aws:swf:region:`<em>account-id</em>`:action/actions/AWS_EC2.InstanceId.Stop/1.0 | arn:aws:swf:region:`<em>account-id</em>`:action/actions/AWS_EC2.InstanceId.Terminate/1.0 | arn:aws:swf:region:`<em>account-id</em>`:action/actions/AWS_EC2.InstanceId.Reboot/1.0

  • :statistic (String)

    The statistic for the metric associated with the alarm, other than percentile. For percentile statistics, use ExtendedStatistic. When you call PutMetricAlarm, you must specify either Statistic or ExtendedStatistic, but not both.

  • :extended_statistic (String)

    The percentile statistic for the metric associated with the alarm. Specify a value between p0.0 and p100. When you call PutMetricAlarm, you must specify either Statistic or ExtendedStatistic, but not both.

  • :dimensions (Array<Types::Dimension>)

    The dimensions for the metric associated with the alarm.

  • :period (required, Integer)

    The period, in seconds, over which the specified statistic is applied. Valid values are 10, 30, and any multiple of 60.

    Be sure to specify 10 or 30 only for metrics that are stored by a PutMetricData call with a StorageResolution of 1. If you specify a Period of 10 or 30 for a metric that does not have sub-minute resolution, the alarm still attempts to gather data at the period rate that you specify. In this case, it does not receive data for the attempts that do not correspond to a one-minute data resolution, and the alarm may often lapse into INSUFFICENT_DATA status. Specifying 10 or 30 also sets this alarm as a high-resolution alarm, which has a higher charge than other alarms. For more information about pricing, see Amazon CloudWatch Pricing.

    An alarm\'s total current evaluation period can be no longer than one day, so Period multiplied by EvaluationPeriods cannot be more than 86,400 seconds.

  • :unit (String)

    The unit of measure for the statistic. For example, the units for the Amazon EC2 NetworkIn metric are Bytes because NetworkIn tracks the number of bytes that an instance receives on all network interfaces. You can also specify a unit when you create a custom metric. Units help provide conceptual meaning to your data. Metric data points that specify a unit of measure, such as Percent, are aggregated separately.

    If you specify a unit, you must use a unit that is appropriate for the metric. Otherwise, the CloudWatch alarm can get stuck in the INSUFFICIENT DATA state.

  • :evaluation_periods (required, Integer)

    The number of periods over which data is compared to the specified threshold. An alarm\'s total current evaluation period can be no longer than one day, so this number multiplied by Period cannot be more than 86,400 seconds.

  • :datapoints_to_alarm (Integer)

    The number of datapoints that must be breaching to trigger the alarm.

  • :threshold (required, Float)

    The value against which the specified statistic is compared.

  • :comparison_operator (required, String)

    The arithmetic operation to use when comparing the specified statistic and threshold. The specified statistic value is used as the first operand.

  • :treat_missing_data (String)

    Sets how this alarm is to handle missing data points. If TreatMissingData is omitted, the default behavior of missing is used. For more information, see Configuring How CloudWatch Alarms Treats Missing Data.

    Valid Values: breaching | notBreaching | ignore | missing

  • :evaluate_low_sample_count_percentile (String)

    Used only for alarms based on percentiles. If you specify ignore, the alarm state does not change during periods with too few data points to be statistically significant. If you specify evaluate or omit this parameter, the alarm is always evaluated and possibly changes state no matter how many data points are available. For more information, see Percentile-Based CloudWatch Alarms and Low Data Samples.

    Valid Values: evaluate | ignore

Returns:

See Also:

#put_dataStruct

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.

Each PutMetricData request is limited to 40 KB in size for HTTP POST requests.

Although the 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 8.515920e-109 to 1.174271e+108 (Base 10) or 2e-360 to 2e360 (Base 2). 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. For more information about specifying dimensions, see Publishing Metrics in the Amazon CloudWatch User Guide.

Data points with time stamps from 24 hours ago or longer can take at least 48 hours to become available for GetMetricStatistics from the time they are submitted.

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

Examples:

Request syntax example with placeholder values


metric.put_data()

Returns:

  • (Struct)

    Returns an empty response.

See Also: