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Class: Aws::CloudWatch::Metric

Inherits:
Object
  • Object
show all
Defined in:
gems/aws-sdk-cloudwatch/lib/aws-sdk-cloudwatch/metric.rb

Defined Under Namespace

Classes: Collection

Actions collapse

Associations collapse

Read-Only Attributes collapse

Instance Method Summary collapse

Constructor Details

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

Returns a new instance of Metric

Overloads:

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

    Parameters:

    • namespace (String)
    • name (String)

    Options Hash (options):

  • #initialize(options = {}) ⇒ Metric

    Options Hash (options):

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


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# File 'gems/aws-sdk-cloudwatch/lib/aws-sdk-cloudwatch/metric.rb', line 21

def initialize(*args)
  options = Hash === args.last ? args.pop.dup : {}
  @namespace = extract_namespace(args, options)
  @name = extract_name(args, options)
  @data = options.delete(:data)
  @client = options.delete(:client) || Client.new(options)
end

Instance Method Details

#alarms(options = {}) ⇒ Alarm::Collection

Examples:

Request syntax with placeholder values


alarms = 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
})

Parameters:

  • options (Hash) (defaults to: {})

    ({})

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:



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# File 'gems/aws-sdk-cloudwatch/lib/aws-sdk-cloudwatch/metric.rb', line 551

def alarms(options = {})
  batches = Enumerator.new do |y|
    batch = []
    options = options.merge(
      namespace: @namespace,
      metric_name: @name
    )
    resp = @client.describe_alarms_for_metric(options)
    resp.data.metric_alarms.each do |m|
      batch << Alarm.new(
        name: m.alarm_name,
        data: m,
        client: @client
      )
    end
    y.yield(batch)
  end
  Alarm::Collection.new(batches)
end

#clientClient

Returns:



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# File 'gems/aws-sdk-cloudwatch/lib/aws-sdk-cloudwatch/metric.rb', line 51

def client
  @client
end

#dataTypes::Metric

Returns the data for this Aws::CloudWatch::Metric. Calls Client#list_metrics if #data_loaded? is false.

Returns:



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# File 'gems/aws-sdk-cloudwatch/lib/aws-sdk-cloudwatch/metric.rb', line 74

def data
  load unless @data
  @data
end

#data_loaded?Boolean

Returns true if this resource is loaded. Accessing attributes or #data on an unloaded resource will trigger a call to #load.

Returns:

  • (Boolean)

    Returns true if this resource is loaded. Accessing attributes or #data on an unloaded resource will trigger a call to #load.



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# File 'gems/aws-sdk-cloudwatch/lib/aws-sdk-cloudwatch/metric.rb', line 82

def data_loaded?
  !!@data
end

#dimensionsArray<Types::Dimension>

The dimensions for the metric.

Returns:



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# File 'gems/aws-sdk-cloudwatch/lib/aws-sdk-cloudwatch/metric.rb', line 44

def dimensions
  data[:dimensions]
end

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

Examples:

Request syntax 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
})

Parameters:

  • options (Hash) (defaults to: {})

    ({})

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, DateTime, Date, Integer, String)

    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, DateTime, Date, Integer, String)

    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:



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# File 'gems/aws-sdk-cloudwatch/lib/aws-sdk-cloudwatch/metric.rb', line 287

def get_statistics(options = {})
  options = options.merge(
    namespace: @namespace,
    metric_name: @name
  )
  resp = @client.get_metric_statistics(options)
  resp.data
end

#loadself Also known as: reload

Loads, or reloads #data for the current Aws::CloudWatch::Metric. Returns self making it possible to chain methods.

metric.reload.data

Returns:

  • (self)


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# File 'gems/aws-sdk-cloudwatch/lib/aws-sdk-cloudwatch/metric.rb', line 61

def load
  resp = @client.list_metrics(
    metric_name: @name,
    namespace: @namespace
  )
  @data = resp.metrics[0]
  self
end

#nameString Also known as: metric_name

Returns:

  • (String)


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# File 'gems/aws-sdk-cloudwatch/lib/aws-sdk-cloudwatch/metric.rb', line 37

def name
  @name
end

#namespaceString

Returns:

  • (String)


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# File 'gems/aws-sdk-cloudwatch/lib/aws-sdk-cloudwatch/metric.rb', line 32

def namespace
  @namespace
end

#put_alarm(options = {}) ⇒ Alarm

Examples:

Request syntax with placeholder values


alarm = 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",
})

Parameters:

  • options (Hash) (defaults to: {})

    ({})

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:{account-id\}:action/actions/AWS_EC2.InstanceId.Stop/1.0 | arn:aws:swf:region:{account-id\}:action/actions/AWS_EC2.InstanceId.Terminate/1.0 | arn:aws:swf:region:{account-id\}: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:{account-id\}:action/actions/AWS_EC2.InstanceId.Stop/1.0 | arn:aws:swf:region:{account-id\}:action/actions/AWS_EC2.InstanceId.Terminate/1.0 | arn:aws:swf:region:{account-id\}: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:{account-id\}:action/actions/AWS_EC2.InstanceId.Stop/1.0 | arn:aws:swf:region:{account-id\}:action/actions/AWS_EC2.InstanceId.Terminate/1.0 | arn:aws:swf:region:{account-id\}: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:



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# File 'gems/aws-sdk-cloudwatch/lib/aws-sdk-cloudwatch/metric.rb', line 469

def put_alarm(options = {})
  options = options.merge(
    namespace: @namespace,
    metric_name: @name
  )
  resp = @client.put_metric_alarm(options)
  Alarm.new(
    name: options[:alarm_name],
    client: @client
  )
end

#put_data(options = {}) ⇒ EmptyStructure

Examples:

Request syntax with placeholder values


metric.put_data({
  metric_data: [ # required
    {
      metric_name: "MetricName", # required
      dimensions: [
        {
          name: "DimensionName", # required
          value: "DimensionValue", # required
        },
      ],
      timestamp: Time.now,
      value: 1.0,
      statistic_values: {
        sample_count: 1.0, # required
        sum: 1.0, # required
        minimum: 1.0, # required
        maximum: 1.0, # 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
      storage_resolution: 1,
    },
  ],
})

Parameters:

  • options (Hash) (defaults to: {})

    ({})

Options Hash (options):

Returns:

  • (EmptyStructure)


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# File 'gems/aws-sdk-cloudwatch/lib/aws-sdk-cloudwatch/metric.rb', line 510

def put_data(options = {})
  options = Aws::Util.deep_merge(options,
    namespace: @namespace,
    metric_data: [{ metric_name: @name }]
  )
  resp = @client.put_metric_data(options)
  resp.data
end

#wait_until(options = {}, &block) ⇒ Resource

Deprecated.

Use [Aws::CloudWatch::Client] #wait_until instead

Note:

The waiting operation is performed on a copy. The original resource remains unchanged

Waiter polls an API operation until a resource enters a desired state.

Basic Usage

Waiter will polls until it is successful, it fails by entering a terminal state, or until a maximum number of attempts are made.

# polls in a loop until condition is true
resource.wait_until(options) {|resource| condition}

Example

instance.wait_until(max_attempts:10, delay:5) {|instance| instance.state.name == 'running' }

Configuration

You can configure the maximum number of polling attempts, and the delay (in seconds) between each polling attempt. The waiting condition is set by passing a block to #wait_until:

# poll for ~25 seconds
resource.wait_until(max_attempts:5,delay:5) {|resource|...}

Callbacks

You can be notified before each polling attempt and before each delay. If you throw :success or :failure from these callbacks, it will terminate the waiter.

started_at = Time.now
# poll for 1 hour, instead of a number of attempts
proc = Proc.new do |attempts, response|
  throw :failure if Time.now - started_at > 3600
end

  # disable max attempts
instance.wait_until(before_wait:proc, max_attempts:nil) {...}

Handling Errors

When a waiter is successful, it returns the Resource. When a waiter fails, it raises an error.

begin
  resource.wait_until(...)
rescue Aws::Waiters::Errors::WaiterFailed
  # resource did not enter the desired state in time
end

attempts attempt in seconds invoked before each attempt invoked before each wait

Parameters:

  • options (Hash) (defaults to: {})

    a customizable set of options

Options Hash (options):

  • :max_attempts (Integer) — default: 10

    Maximum number of

  • :delay (Integer) — default: 10

    Delay between each

  • :before_attempt (Proc) — default: nil

    Callback

  • :before_wait (Proc) — default: nil

    Callback

Returns:

  • (Resource)

    if the waiter was successful

Raises:

  • (Aws::Waiters::Errors::FailureStateError)

    Raised when the waiter terminates because the waiter has entered a state that it will not transition out of, preventing success.

    yet successful.

  • (Aws::Waiters::Errors::UnexpectedError)

    Raised when an error is encountered while polling for a resource that is not expected.

  • (NotImplementedError)

    Raised when the resource does not



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# File 'gems/aws-sdk-cloudwatch/lib/aws-sdk-cloudwatch/metric.rb', line 164

def wait_until(options = {}, &block)
  self_copy = self.dup
  attempts = 0
  options[:max_attempts] = 10 unless options.key?(:max_attempts)
  options[:delay] ||= 10
  options[:poller] = Proc.new do
    attempts += 1
    if block.call(self_copy)
      [:success, self_copy]
    else
      self_copy.reload unless attempts == options[:max_attempts]
      :retry
    end
  end
  Aws::Waiters::Waiter.new(options).wait({})
end