CfnCompositeAlarm¶

class aws_cdk.aws_cloudwatch.CfnCompositeAlarm(scope, id, *, alarm_name, alarm_rule, actions_enabled=None, alarm_actions=None, alarm_description=None, insufficient_data_actions=None, ok_actions=None)¶

Bases: aws_cdk.core.CfnResource

A CloudFormation AWS::CloudWatch::CompositeAlarm.

The AWS::CloudWatch::CompositeAlarm type creates or updates a composite alarm. When you create a composite alarm, you specify a rule expression for the alarm that takes into account the alarm states of other alarms that you have created. The composite alarm goes into ALARM state only if all conditions of the rule are met.

The alarms specified in a composite alarm’s rule expression can include metric alarms and other composite alarms.

Using composite alarms can reduce alarm noise. You can create multiple metric alarms, and also create a composite alarm and set up alerts only for the composite alarm. For example, you could create a composite alarm that goes into ALARM state only when more than one of the underlying metric alarms are in ALARM state.

Currently, the only alarm actions that can be taken by composite alarms are notifying SNS topics.

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. For a composite alarm, this initial time after creation is the only time that the alarm can be in INSUFFICIENT_DATA state.

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

CloudformationResource: AWS::CloudWatch::CompositeAlarm
Link: http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-cloudwatch-compositealarm.html
ExampleMetadata: fixture=_generated

Example:

# The code below shows an example of how to instantiate this type.
# The values are placeholders you should change.
import aws_cdk.aws_cloudwatch as cloudwatch

cfn_composite_alarm = cloudwatch.CfnCompositeAlarm(self, "MyCfnCompositeAlarm",
    alarm_name="alarmName",
    alarm_rule="alarmRule",

    # the properties below are optional
    actions_enabled=False,
    alarm_actions=["alarmActions"],
    alarm_description="alarmDescription",
    insufficient_data_actions=["insufficientDataActions"],
    ok_actions=["okActions"]
)

Create a new AWS::CloudWatch::CompositeAlarm.

Parameters

scope (Construct) –
- scope in which this resource is defined.
id (str) –
- scoped id of the resource.
alarm_name (str) – The name for the composite alarm. This name must be unique within your AWS account.
alarm_rule (str) – An expression that specifies which other alarms are to be evaluated to determine this composite alarm’s state. For each alarm that you reference, you designate a function that specifies whether that alarm needs to be in ALARM state, OK state, or INSUFFICIENT_DATA state. You can use operators (AND, OR and NOT) to combine multiple functions in a single expression. You can use parenthesis to logically group the functions in your expression. You can use either alarm names or ARNs to reference the other alarms that are to be evaluated. Functions can include the following: - ALARM(“alarm-name or alarm-ARN”) is TRUE if the named alarm is in ALARM state. - OK(“alarm-name or alarm-ARN”) is TRUE if the named alarm is in OK state. - INSUFFICIENT_DATA(“alarm-name or alarm-ARN”) is TRUE if the named alarm is in INSUFFICIENT_DATA state. - TRUE always evaluates to TRUE. - FALSE always evaluates to FALSE. TRUE and FALSE are useful for testing a complex AlarmRule structure, and for testing your alarm actions. For more information about AlarmRule syntax, see PutCompositeAlarm in the Amazon CloudWatch API Reference .
actions_enabled (Union[bool, IResolvable, None]) – Indicates whether actions should be executed during any changes to the alarm state of the composite alarm. The default is TRUE.
alarm_actions (Optional[Sequence[str]]) –
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). For more information about creating alarms and the actions that you can specify, see PutCompositeAlarm in the Amazon CloudWatch API Reference .
alarm_description (Optional[str]) – The description for the composite alarm.
insufficient_data_actions (Optional[Sequence[str]]) –
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). For more information about creating alarms and the actions that you can specify, see PutCompositeAlarm in the Amazon CloudWatch API Reference .
ok_actions (Optional[Sequence[str]]) –
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). For more information about creating alarms and the actions that you can specify, see PutCompositeAlarm in the Amazon CloudWatch API Reference .

Methods

add_deletion_override(path)¶

Syntactic sugar for addOverride(path, undefined).

Parameters: path (str) – The path of the value to delete.
Return type: None

add_depends_on(target)¶

Indicates that this resource depends on another resource and cannot be provisioned unless the other resource has been successfully provisioned.

This can be used for resources across stacks (or nested stack) boundaries and the dependency will automatically be transferred to the relevant scope.

Parameters

target (CfnResource) –

Return type

None

add_metadata(key, value)¶

Add a value to the CloudFormation Resource Metadata.

Parameters

key (str) –
value (Any) –

See

https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/metadata-section-structure.html

Note that this is a different set of metadata from CDK node metadata; this metadata ends up in the stack template under the resource, whereas CDK node metadata ends up in the Cloud Assembly.

Return type: None

add_override(path, value)¶

Adds an override to the synthesized CloudFormation resource.

To add a property override, either use addPropertyOverride or prefix path with “Properties.” (i.e. Properties.TopicName).

If the override is nested, separate each nested level using a dot (.) in the path parameter. If there is an array as part of the nesting, specify the index in the path.

To include a literal . in the property name, prefix with a \. In most programming languages you will need to write this as "\\." because the \ itself will need to be escaped.

For example:

cfn_resource.add_override("Properties.GlobalSecondaryIndexes.0.Projection.NonKeyAttributes", ["myattribute"])
cfn_resource.add_override("Properties.GlobalSecondaryIndexes.1.ProjectionType", "INCLUDE")

would add the overrides Example:

"Properties": {
   "GlobalSecondaryIndexes": [
     {
       "Projection": {
         "NonKeyAttributes": [ "myattribute" ]
         ...
       }
       ...
     },
     {
       "ProjectionType": "INCLUDE"
       ...
     },
   ]
   ...
}

Parameters

path (str) –
- The path of the property, you can use dot notation to override values in complex types. Any intermdediate keys will be created as needed.
value (Any) –
- The value. Could be primitive or complex.

Return type

None

add_property_deletion_override(property_path)¶

Adds an override that deletes the value of a property from the resource definition.

Parameters: property_path (str) – The path to the property.
Return type: None

add_property_override(property_path, value)¶

Adds an override to a resource property.

Syntactic sugar for addOverride("Properties.<...>", value).

Parameters

property_path (str) – The path of the property.
value (Any) – The value.

Return type

None

apply_removal_policy(policy=None, *, apply_to_update_replace_policy=None, default=None)¶

Sets the deletion policy of the resource based on the removal policy specified.

The Removal Policy controls what happens to this resource when it stops being managed by CloudFormation, either because you’ve removed it from the CDK application or because you’ve made a change that requires the resource to be replaced.

The resource can be deleted (RemovalPolicy.DESTROY), or left in your AWS account for data recovery and cleanup later (RemovalPolicy.RETAIN).

Parameters

policy (Optional[RemovalPolicy]) –
apply_to_update_replace_policy (Optional[bool]) – Apply the same deletion policy to the resource’s “UpdateReplacePolicy”. Default: true
default (Optional[RemovalPolicy]) – The default policy to apply in case the removal policy is not defined. Default: - Default value is resource specific. To determine the default value for a resoure, please consult that specific resource’s documentation.

Return type

None

get_att(attribute_name)¶

Returns a token for an runtime attribute of this resource.

Ideally, use generated attribute accessors (e.g. resource.arn), but this can be used for future compatibility in case there is no generated attribute.

Parameters: attribute_name (str) – The name of the attribute.
Return type: Reference

get_metadata(key)¶

Retrieve a value value from the CloudFormation Resource Metadata.

Parameters

key (str) –

See

https://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/metadata-section-structure.html

Note that this is a different set of metadata from CDK node metadata; this metadata ends up in the stack template under the resource, whereas CDK node metadata ends up in the Cloud Assembly.

Return type: Any

inspect(inspector)¶

Examines the CloudFormation resource and discloses attributes.

Parameters

inspector (TreeInspector) –

tree inspector to collect and process attributes.

Return type

None

override_logical_id(new_logical_id)¶

Overrides the auto-generated logical ID with a specific ID.

Parameters: new_logical_id (str) – The new logical ID to use for this stack element.
Return type: None

to_string()¶

Returns a string representation of this construct.

Return type: str
Returns: a string representation of this resource

Attributes

CFN_RESOURCE_TYPE_NAME = 'AWS::CloudWatch::CompositeAlarm'¶

actions_enabled¶

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

The default is TRUE.

Link: http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-cloudwatch-compositealarm.html#cfn-cloudwatch-compositealarm-actionsenabled
Return type: Union[bool, IResolvable, None]

alarm_actions¶

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). For more information about creating alarms and the actions that you can specify, see PutCompositeAlarm in the Amazon CloudWatch API Reference .

Link: http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-cloudwatch-compositealarm.html#cfn-cloudwatch-compositealarm-alarmactions
Return type: Optional[List[str]]

alarm_description¶

The description for the composite alarm.

Link: http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-cloudwatch-compositealarm.html#cfn-cloudwatch-compositealarm-alarmdescription
Return type: Optional[str]

alarm_name¶

The name for the composite alarm.

This name must be unique within your AWS account.

Link: http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-cloudwatch-compositealarm.html#cfn-cloudwatch-compositealarm-alarmname
Return type: str

alarm_rule¶

An expression that specifies which other alarms are to be evaluated to determine this composite alarm’s state.

For each alarm that you reference, you designate a function that specifies whether that alarm needs to be in ALARM state, OK state, or INSUFFICIENT_DATA state. You can use operators (AND, OR and NOT) to combine multiple functions in a single expression. You can use parenthesis to logically group the functions in your expression.

You can use either alarm names or ARNs to reference the other alarms that are to be evaluated.

Functions can include the following:

ALARM(“alarm-name or alarm-ARN”) is TRUE if the named alarm is in ALARM state.
OK(“alarm-name or alarm-ARN”) is TRUE if the named alarm is in OK state.
INSUFFICIENT_DATA(“alarm-name or alarm-ARN”) is TRUE if the named alarm is in INSUFFICIENT_DATA state.
TRUE always evaluates to TRUE.
FALSE always evaluates to FALSE.

TRUE and FALSE are useful for testing a complex AlarmRule structure, and for testing your alarm actions.

For more information about AlarmRule syntax, see PutCompositeAlarm in the Amazon CloudWatch API Reference .

Link: http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-cloudwatch-compositealarm.html#cfn-cloudwatch-compositealarm-alarmrule
Return type: str

attr_arn¶

The ARN of the composite alarm, such as arn:aws:cloudwatch:us-west-2:123456789012:alarm/CompositeAlarmName .

CloudformationAttribute: Arn
Return type: str

cfn_options¶

Options for this resource, such as condition, update policy etc.

Return type: ICfnResourceOptions

cfn_resource_type¶

AWS resource type.

Return type: str

creation_stack¶

return:

the stack trace of the point where this Resource was created from, sourced from the +metadata+ entry typed +aws:cdk:logicalId+, and with the bottom-most node +internal+ entries filtered.

Return type: List[str]

insufficient_data_actions¶

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). For more information about creating alarms and the actions that you can specify, see PutCompositeAlarm in the Amazon CloudWatch API Reference .

Link: http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-cloudwatch-compositealarm.html#cfn-cloudwatch-compositealarm-insufficientdataactions
Return type: Optional[List[str]]

logical_id¶

The logical ID for this CloudFormation stack element.

The logical ID of the element is calculated from the path of the resource node in the construct tree.

To override this value, use overrideLogicalId(newLogicalId).

Return type: str
Returns

the logical ID as a stringified token. This value will only get resolved during synthesis.

node¶

The construct tree node associated with this construct.

Return type: ConstructNode

ok_actions¶

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). For more information about creating alarms and the actions that you can specify, see PutCompositeAlarm in the Amazon CloudWatch API Reference .

Link: http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/aws-resource-cloudwatch-compositealarm.html#cfn-cloudwatch-compositealarm-okactions
Return type: Optional[List[str]]

ref¶

Return a string that will be resolved to a CloudFormation { Ref } for this element.

If, by any chance, the intrinsic reference of a resource is not a string, you could coerce it to an IResolvable through Lazy.any({ produce: resource.ref }).

Return type: str

stack¶

The stack in which this element is defined.

CfnElements must be defined within a stack scope (directly or indirectly).

Return type: Stack

Static Methods

classmethod is_cfn_element(x)¶

Returns true if a construct is a stack element (i.e. part of the synthesized cloudformation template).

Uses duck-typing instead of instanceof to allow stack elements from different versions of this library to be included in the same stack.

Parameters

x (Any) –

Return type

bool

Returns

The construct as a stack element or undefined if it is not a stack element.

classmethod is_cfn_resource(construct)¶

Check whether the given construct is a CfnResource.

Parameters

construct (IConstruct) –

Return type

bool

classmethod is_construct(x)¶

Return whether the given object is a Construct.

Parameters

x (Any) –

Return type

bool