Package software.amazon.awscdk.services.cloudwatch

Class CfnAlarm

java.lang.Object
software.amazon.jsii.JsiiObject
software.constructs.Construct
software.amazon.awscdk.core.Construct
software.amazon.awscdk.core.CfnElement
software.amazon.awscdk.core.CfnRefElement
software.amazon.awscdk.core.CfnResource
software.amazon.awscdk.services.cloudwatch.CfnAlarm
All Implemented Interfaces:
IConstruct, IDependable, IInspectable, software.amazon.jsii.JsiiSerializable, software.constructs.IConstruct
@Generated(value="jsii-pacmak/1.84.0 (build 5404dcf)", date="2023-06-19T16:30:36.775Z") @Stability(Stable) public class CfnAlarm extends CfnResource implements IInspectable
A CloudFormation AWS::CloudWatch::Alarm.

The AWS::CloudWatch::Alarm type specifies an alarm and associates it with the specified metric or metric math expression.

When this operation creates an alarm, the alarm state is immediately set to INSUFFICIENT_DATA . The alarm is then evaluated and its state is set appropriately. Any actions associated with the new state are then executed.

When you update an existing alarm, its state is left unchanged, but the update completely overwrites the previous configuration of the alarm.

Example: 

 // The code below shows an example of how to instantiate this type.
 // The values are placeholders you should change.
 import software.amazon.awscdk.services.cloudwatch.*;
 CfnAlarm cfnAlarm = CfnAlarm.Builder.create(this, "MyCfnAlarm")
         .comparisonOperator("comparisonOperator")
         .evaluationPeriods(123)
         // the properties below are optional
         .actionsEnabled(false)
         .alarmActions(List.of("alarmActions"))
         .alarmDescription("alarmDescription")
         .alarmName("alarmName")
         .datapointsToAlarm(123)
         .dimensions(List.of(DimensionProperty.builder()
                 .name("name")
                 .value("value")
                 .build()))
         .evaluateLowSampleCountPercentile("evaluateLowSampleCountPercentile")
         .extendedStatistic("extendedStatistic")
         .insufficientDataActions(List.of("insufficientDataActions"))
         .metricName("metricName")
         .metrics(List.of(MetricDataQueryProperty.builder()
                 .id("id")
                 // the properties below are optional
                 .accountId("accountId")
                 .expression("expression")
                 .label("label")
                 .metricStat(MetricStatProperty.builder()
                         .metric(MetricProperty.builder()
                                 .dimensions(List.of(DimensionProperty.builder()
                                         .name("name")
                                         .value("value")
                                         .build()))
                                 .metricName("metricName")
                                 .namespace("namespace")
                                 .build())
                         .period(123)
                         .stat("stat")
                         // the properties below are optional
                         .unit("unit")
                         .build())
                 .period(123)
                 .returnData(false)
                 .build()))
         .namespace("namespace")
         .okActions(List.of("okActions"))
         .period(123)
         .statistic("statistic")
         .threshold(123)
         .thresholdMetricId("thresholdMetricId")
         .treatMissingData("treatMissingData")
         .unit("unit")
         .build();

  • Field Details

    • CFN_RESOURCE_TYPE_NAME

      @Stability(Stable) public static final String CFN_RESOURCE_TYPE_NAME
      The CloudFormation resource type name for this resource class.

  • Constructor Details

    • CfnAlarm

      protected CfnAlarm(software.amazon.jsii.JsiiObjectRef objRef)

    • CfnAlarm

      protected CfnAlarm(software.amazon.jsii.JsiiObject.InitializationMode initializationMode)

    • CfnAlarm

      @Stability(Stable) public CfnAlarm(@NotNull Construct scope, @NotNull String id, @NotNull CfnAlarmProps props)
      Create a new AWS::CloudWatch::Alarm.

      Parameters:
      scope -
      • scope in which this resource is defined.
      This parameter is required.
      id -
      • scoped id of the resource.
      This parameter is required.
      props -
      • resource properties.
      This parameter is required.

  • Method Details

    • inspect

      @Stability(Stable) public void inspect(@NotNull TreeInspector inspector)
      Examines the CloudFormation resource and discloses attributes.

      Specified by:
      inspect in interface IInspectable
      Parameters:
      inspector -
      • tree inspector to collect and process attributes.
      This parameter is required.

    • renderProperties

      @Stability(Stable) @NotNull protected Map<String,Object> renderProperties(@NotNull Map<String,Object> props)
      Overrides:
      renderProperties in class CfnResource
      Parameters:
      props - This parameter is required.

    • getAttrArn

      @Stability(Stable) @NotNull public String getAttrArn()
      The ARN of the CloudWatch alarm, such as arn:aws:cloudwatch:us-west-2:123456789012:alarm:myCloudWatchAlarm-CPUAlarm-UXMMZK36R55Z .

    • getCfnProperties

      @Stability(Stable) @NotNull protected Map<String,Object> getCfnProperties()
      Overrides:
      getCfnProperties in class CfnResource

    • getComparisonOperator

      @Stability(Stable) @NotNull public String getComparisonOperator()
      The arithmetic operation to use when comparing the specified statistic and threshold.

      The specified statistic value is used as the first operand.

      You can specify the following values: GreaterThanThreshold , GreaterThanOrEqualToThreshold , LessThanThreshold , or LessThanOrEqualToThreshold .

    • setComparisonOperator

      @Stability(Stable) public void setComparisonOperator(@NotNull String value)
      The arithmetic operation to use when comparing the specified statistic and threshold.

      The specified statistic value is used as the first operand.

      You can specify the following values: GreaterThanThreshold , GreaterThanOrEqualToThreshold , LessThanThreshold , or LessThanOrEqualToThreshold .

    • getEvaluationPeriods

      @Stability(Stable) @NotNull public Number getEvaluationPeriods()
      The number of periods over which data is compared to the specified threshold.

      If you are setting an alarm that requires that a number of consecutive data points be breaching to trigger the alarm, this value specifies that number. If you are setting an "M out of N" alarm, this value is the N, and DatapointsToAlarm is the M.

      For more information, see Evaluating an Alarm in the Amazon CloudWatch User Guide .

    • setEvaluationPeriods

      @Stability(Stable) public void setEvaluationPeriods(@NotNull Number value)
      The number of periods over which data is compared to the specified threshold.

      If you are setting an alarm that requires that a number of consecutive data points be breaching to trigger the alarm, this value specifies that number. If you are setting an "M out of N" alarm, this value is the N, and DatapointsToAlarm is the M.

      For more information, see Evaluating an Alarm in the Amazon CloudWatch User Guide .

    • getActionsEnabled

      @Stability(Stable) @Nullable public Object getActionsEnabled()
      Indicates whether actions should be executed during any changes to the alarm state.

      The default is TRUE.

    • setActionsEnabled

      @Stability(Stable) public void setActionsEnabled(@Nullable Boolean value)
      Indicates whether actions should be executed during any changes to the alarm state.

      The default is TRUE.

    • setActionsEnabled

      @Stability(Stable) public void setActionsEnabled(@Nullable IResolvable value)
      Indicates whether actions should be executed during any changes to the alarm state.

      The default is TRUE.

    • getAlarmActions

      @Stability(Stable) @Nullable public List<String> getAlarmActions()
      The list of actions to execute when this alarm transitions into an ALARM state from any other state.

      Specify each action as an Amazon Resource Name (ARN). For more information about creating alarms and the actions that you can specify, see PutMetricAlarm in the Amazon CloudWatch API Reference .

    • setAlarmActions

      @Stability(Stable) public void setAlarmActions(@Nullable List<String> value)
      The list of actions to execute when this alarm transitions into an ALARM state from any other state.

      Specify each action as an Amazon Resource Name (ARN). For more information about creating alarms and the actions that you can specify, see PutMetricAlarm in the Amazon CloudWatch API Reference .

    • getAlarmDescription

      @Stability(Stable) @Nullable public String getAlarmDescription()
      The description of the alarm.

    • setAlarmDescription

      @Stability(Stable) public void setAlarmDescription(@Nullable String value)
      The description of the alarm.

    • getAlarmName

      @Stability(Stable) @Nullable public String getAlarmName()
      The name of the alarm.

      If you don't specify a name, AWS CloudFormation generates a unique physical ID and uses that ID for the alarm name.

      If you specify a name, you cannot perform updates that require replacement of this resource. You can perform updates that require no or some interruption. If you must replace the resource, specify a new name.

    • setAlarmName

      @Stability(Stable) public void setAlarmName(@Nullable String value)
      The name of the alarm.

      If you don't specify a name, AWS CloudFormation generates a unique physical ID and uses that ID for the alarm name.

      If you specify a name, you cannot perform updates that require replacement of this resource. You can perform updates that require no or some interruption. If you must replace the resource, specify a new name.

    • getDatapointsToAlarm

      @Stability(Stable) @Nullable public Number getDatapointsToAlarm()
      The number of datapoints that must be breaching to trigger the alarm.

      This is used only if you are setting an "M out of N" alarm. In that case, this value is the M, and the value that you set for EvaluationPeriods is the N value. For more information, see Evaluating an Alarm in the Amazon CloudWatch User Guide .

      If you omit this parameter, CloudWatch uses the same value here that you set for EvaluationPeriods , and the alarm goes to alarm state if that many consecutive periods are breaching.

    • setDatapointsToAlarm

      @Stability(Stable) public void setDatapointsToAlarm(@Nullable Number value)
      The number of datapoints that must be breaching to trigger the alarm.

      This is used only if you are setting an "M out of N" alarm. In that case, this value is the M, and the value that you set for EvaluationPeriods is the N value. For more information, see Evaluating an Alarm in the Amazon CloudWatch User Guide .

      If you omit this parameter, CloudWatch uses the same value here that you set for EvaluationPeriods , and the alarm goes to alarm state if that many consecutive periods are breaching.

    • getDimensions

      @Stability(Stable) @Nullable public Object getDimensions()
      The dimensions for the metric associated with the alarm.

      For an alarm based on a math expression, you can't specify Dimensions . Instead, you use Metrics .

    • setDimensions

      @Stability(Stable) public void setDimensions(@Nullable IResolvable value)
      The dimensions for the metric associated with the alarm.

      For an alarm based on a math expression, you can't specify Dimensions . Instead, you use Metrics .

    • setDimensions

      @Stability(Stable) public void setDimensions(@Nullable List<Object> value)
      The dimensions for the metric associated with the alarm.

      For an alarm based on a math expression, you can't specify Dimensions . Instead, you use Metrics .

    • getEvaluateLowSampleCountPercentile

      @Stability(Stable) @Nullable public String getEvaluateLowSampleCountPercentile()
      Used only for alarms based on percentiles.

      If ignore , the alarm state does not change during periods with too few data points to be statistically significant. If evaluate or this parameter is not used, the alarm is always evaluated and possibly changes state no matter how many data points are available.

    • setEvaluateLowSampleCountPercentile

      @Stability(Stable) public void setEvaluateLowSampleCountPercentile(@Nullable String value)
      Used only for alarms based on percentiles.

      If ignore , the alarm state does not change during periods with too few data points to be statistically significant. If evaluate or this parameter is not used, the alarm is always evaluated and possibly changes state no matter how many data points are available.

    • getExtendedStatistic

      @Stability(Stable) @Nullable public String getExtendedStatistic()
      The percentile statistic for the metric associated with the alarm. Specify a value between p0.0 and p100.

      For an alarm based on a metric, you must specify either Statistic or ExtendedStatistic but not both.

      For an alarm based on a math expression, you can't specify ExtendedStatistic . Instead, you use Metrics .

    • setExtendedStatistic

      @Stability(Stable) public void setExtendedStatistic(@Nullable String value)
      The percentile statistic for the metric associated with the alarm. Specify a value between p0.0 and p100.

      For an alarm based on a metric, you must specify either Statistic or ExtendedStatistic but not both.

      For an alarm based on a math expression, you can't specify ExtendedStatistic . Instead, you use Metrics .

    • getInsufficientDataActions

      @Stability(Stable) @Nullable public List<String> getInsufficientDataActions()
      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).

    • setInsufficientDataActions

      @Stability(Stable) public void setInsufficientDataActions(@Nullable List<String> value)
      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).

    • getMetricName

      @Stability(Stable) @Nullable public String getMetricName()
      The name of the metric associated with the alarm.

      This is required for an alarm based on a metric. For an alarm based on a math expression, you use Metrics instead and you can't specify MetricName .

    • setMetricName

      @Stability(Stable) public void setMetricName(@Nullable String value)
      The name of the metric associated with the alarm.

      This is required for an alarm based on a metric. For an alarm based on a math expression, you use Metrics instead and you can't specify MetricName .

    • getMetrics

      @Stability(Stable) @Nullable public Object getMetrics()
      An array that enables you to create an alarm based on the result of a metric math expression.

      Each item in the array either retrieves a metric or performs a math expression.

      If you specify the Metrics parameter, you cannot specify MetricName , Dimensions , Period , Namespace , Statistic , ExtendedStatistic , or Unit .

    • setMetrics

      @Stability(Stable) public void setMetrics(@Nullable IResolvable value)
      An array that enables you to create an alarm based on the result of a metric math expression.

      Each item in the array either retrieves a metric or performs a math expression.

      If you specify the Metrics parameter, you cannot specify MetricName , Dimensions , Period , Namespace , Statistic , ExtendedStatistic , or Unit .

    • setMetrics

      @Stability(Stable) public void setMetrics(@Nullable List<Object> value)
      An array that enables you to create an alarm based on the result of a metric math expression.

      Each item in the array either retrieves a metric or performs a math expression.

      If you specify the Metrics parameter, you cannot specify MetricName , Dimensions , Period , Namespace , Statistic , ExtendedStatistic , or Unit .

    • getNamespace

      @Stability(Stable) @Nullable public String getNamespace()
      The namespace of the metric associated with the alarm.

      This is required for an alarm based on a metric. For an alarm based on a math expression, you can't specify Namespace and you use Metrics instead.

      For a list of namespaces for metrics from AWS services, see AWS Services That Publish CloudWatch Metrics.

    • setNamespace

      @Stability(Stable) public void setNamespace(@Nullable String value)
      The namespace of the metric associated with the alarm.

      This is required for an alarm based on a metric. For an alarm based on a math expression, you can't specify Namespace and you use Metrics instead.

      For a list of namespaces for metrics from AWS services, see AWS Services That Publish CloudWatch Metrics.

    • getOkActions

      @Stability(Stable) @Nullable public List<String> getOkActions()
      The actions to execute when this alarm transitions to the OK state from any other state.

      Each action is specified as an Amazon Resource Name (ARN).

    • setOkActions

      @Stability(Stable) public void setOkActions(@Nullable List<String> value)
      The actions to execute when this alarm transitions to the OK state from any other state.

      Each action is specified as an Amazon Resource Name (ARN).

    • getPeriod

      @Stability(Stable) @Nullable public Number getPeriod()
      The period, in seconds, over which the statistic is applied.

      This is required for an alarm based on a metric. Valid values are 10, 30, 60, and any multiple of 60.

      For an alarm based on a math expression, you can't specify Period , and instead you use the Metrics parameter.

      Minimum: 10

    • setPeriod

      @Stability(Stable) public void setPeriod(@Nullable Number value)
      The period, in seconds, over which the statistic is applied.

      This is required for an alarm based on a metric. Valid values are 10, 30, 60, and any multiple of 60.

      For an alarm based on a math expression, you can't specify Period , and instead you use the Metrics parameter.

      Minimum: 10

    • getStatistic

      @Stability(Stable) @Nullable public String getStatistic()
      The statistic for the metric associated with the alarm, other than percentile. For percentile statistics, use ExtendedStatistic .

      For an alarm based on a metric, you must specify either Statistic or ExtendedStatistic but not both.

      For an alarm based on a math expression, you can't specify Statistic . Instead, you use Metrics .

    • setStatistic

      @Stability(Stable) public void setStatistic(@Nullable String value)
      The statistic for the metric associated with the alarm, other than percentile. For percentile statistics, use ExtendedStatistic .

      For an alarm based on a metric, you must specify either Statistic or ExtendedStatistic but not both.

      For an alarm based on a math expression, you can't specify Statistic . Instead, you use Metrics .

    • getThreshold

      @Stability(Stable) @Nullable public Number getThreshold()
      The value to compare with the specified statistic.

    • setThreshold

      @Stability(Stable) public void setThreshold(@Nullable Number value)
      The value to compare with the specified statistic.

    • getThresholdMetricId

      @Stability(Stable) @Nullable public String getThresholdMetricId()
      In an alarm based on an anomaly detection model, this is the ID of the ANOMALY_DETECTION_BAND function used as the threshold for the alarm.

    • setThresholdMetricId

      @Stability(Stable) public void setThresholdMetricId(@Nullable String value)
      In an alarm based on an anomaly detection model, this is the ID of the ANOMALY_DETECTION_BAND function used as the threshold for the alarm.

    • getTreatMissingData

      @Stability(Stable) @Nullable public String getTreatMissingData()
      Sets how this alarm is to handle missing data points.

      Valid values are breaching , notBreaching , ignore , and missing . For more information, see Configuring How CloudWatch Alarms Treat Missing Data in the Amazon CloudWatch User Guide .

      If you omit this parameter, the default behavior of missing is used.

    • setTreatMissingData

      @Stability(Stable) public void setTreatMissingData(@Nullable String value)
      Sets how this alarm is to handle missing data points.

      Valid values are breaching , notBreaching , ignore , and missing . For more information, see Configuring How CloudWatch Alarms Treat Missing Data in the Amazon CloudWatch User Guide .

      If you omit this parameter, the default behavior of missing is used.

    • getUnit

      @Stability(Stable) @Nullable public String getUnit()
      The unit of the metric associated with the alarm.

      Specify this only if you are creating an alarm based on a single metric. Do not specify this if you are specifying a Metrics array.

      You can specify the following 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, or None.

    • setUnit

      @Stability(Stable) public void setUnit(@Nullable String value)
      The unit of the metric associated with the alarm.

      Specify this only if you are creating an alarm based on a single metric. Do not specify this if you are specifying a Metrics array.

      You can specify the following 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, or None.