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Description:

renovosolutions.awscdkcloudwatchalarms 0.0.3

cdk-library-cloudwatch-alarms
WIP - Library to provide constructs, aspects, and construct extensions to more easily set up alarms for AWS resources in CDK code based on AWS recommended alarms list. This project is still in early development so YMMV.
Usage
This library is flexible in its approach and there are multiple paths to configuring alarms depending on how you'd like to work with the recommended alarms.
Feature Availability
Intended feature list as of Aug 2024

Aspects to apply recommended alarms to a wide scope such as a whole CDK app

Ability to exclude specific alarms
Ability to define a default set of alarm actions
Ability to modify the configuration of each alarm type
Ability to exclude specific resources

Constructs to ease alarm configuration for individual resources at a granular scope

Constructs for each available alarm according to the coverage table
Constructs for applying all recommended alarms to a specific resource
Ability to exclude specific alarms from the all recommended alarms construct

Extended versions of resource constructs with alarm helper methods

Resource Coverage
If its not shown it hasn't been worked on.

Service
Status
Notes

S3
[x] 4xxErrors[x] 5xxErrors[ ] OperationsFailedReplication
Replication errors are difficult to set up in CDK at the moment due to rule properties being IResolvables and replication rules not being available on the L2 Bucket construct

SQS
[x] ApproximateAgeOfOldestMessage[x] ApproximateNumberOfMessagesNotVisible[x] ApproximateNumberOfMessagesVisible[x] NumberOfMessagesSent
All alarms with the exception of number of messages sent require a user defined threshold because its very usecase specific

SNS
[x] NumberOfMessagesPublished[x] NumberOfNotificationsDelivered[x] NumberOfNotificationsFailed[x] NumberOfNotificationsFilteredOut-InvalidAttributes[x] NumberOfNotificationsFilteredOut-InvalidMessageBody[x] NumberOfNotificationsRedrivenToDlq[x] NumberOfNotificationsFailedToRedriveToDlq[ ] SMSMonthToDateSpentUSD[ ] SMSSuccessRate
Some alarms require a threshold to be defined. SMS alarms are not implememented.

Lambda
[ ] ClaimedAccountConcurrency[x] Errors[x] Throttles[x] Duration[x] ConcurrentExecutions
ClaimedAccountConcurrency is account wide and one time so not covered by this library at this time

Aspects
Below is an example of configuring the Lambda aspect. You must configure non-defaults for alarms which is most cases is only a threshold. Since the aspect is applied at the app level it applies to both the TestStack and TestStack2 lambda functions and will create all available recommended alarms for those functions. See references for additional details on Aspects which can be applied to the app, stack, or individual constructs depending on your use case.
import { App, Stack, Aspects, aws_lambda as lambda } from 'aws-cdk-lib';
import * as recommendedalarms from '@renovosolutions/cdk-library-cloudwatch-alarms';

const app = new App();
const stack = new Stack(app, 'TestStack', {
env: {
account: '123456789012',
region: 'us-east-1',
},
});

const stack2 = new Stack(app, 'TestStack2', {
env: {
account: '123456789012',
region: 'us-east-1',
},
});

const appAspects = Aspects.of(app);

appAspects.add(
new recommendedalarms.LambdaRecommendedAlarmsAspect({
configDurationAlarm: {
threshold: 15,
},
configErrorsAlarm: {
threshold: 1,
},
configThrottlesAlarm: {
threshold: 0,
},
}),
);

new lambda.Function(stack, 'Lambda', {
runtime: lambda.Runtime.NODEJS_20_X,
handler: 'index.handler',
code: lambda.Code.fromInline('exports.handler = async (event) => { console.log(event); }'),
});

new lambda.Function(stack2, 'Lambda2', {
runtime: lambda.Runtime.NODEJS_20_X,
handler: 'index.handler',
code: lambda.Code.fromInline('exports.handler = async (event) => { console.log(event); }'),
});

Recommended Alarm Constructs
You can also apply alarms to a specific resource using the recommended alarm construct for a given resource type. For example if you have an S3 Bucket you might do something like below. None of the S3 alarms require configuration so no config props are needed in this case:
import { App, Stack, Aspects, aws_s3 as s3 } from 'aws-cdk-lib';
import * as recommendedalarms from '@renovosolutions/cdk-library-cloudwatch-alarms';

const app = new App();
const stack = new Stack(app, 'TestStack', {
env: {
account: '123456789012',
region: 'us-east-1',
},
});

const bucket = new s3.Bucket(stack, 'Bucket', {});

new recommendedalarms.S3RecommendedAlarms(stack, 'RecommendedAlarms', {
bucket,
});

Individual Constructs
You can also apply specific alarms from their individual constructs:
import { App, Stack, Aspects, aws_s3 as s3 } from 'aws-cdk-lib';
import * as recommendedalarms from '@renovosolutions/cdk-library-cloudwatch-alarms';

const app = new App();
const stack = new Stack(app, 'TestStack', {
env: {
account: '123456789012',
region: 'us-east-1',
},
});

const bucket = new s3.Bucket(stack, 'Bucket', {});

new recommendedalarms.S3Bucket5xxErrorsAlarm(stack, 'RecommendedAlarms', {
bucket,
threshold: 0.10,
});

Construct Extensions
You can use extended versions of the constructs you are familiar with to expose helper methods for alarms if you'd like to keep alarms more tightly coupled to specific resources.
import { App, Stack, Aspects, aws_s3 as s3 } from 'aws-cdk-lib';
import * as recommendedalarms from '@renovosolutions/cdk-library-cloudwatch-alarms';

const app = new App();
const stack = new Stack(app, 'TestStack', {
env: {
account: '123456789012',
region: 'us-east-1',
},
});

const bucket = new recommendedalarms.Bucket(stack, 'Bucket', {});

bucket.applyRecommendedAlarms();

Alarm Actions
You can apply alarm actions using the default actions on an aspect or all recommended alarms construct or you can apply individual alarm actions for helper methods of individual constructs. See below where default actions are set but an override is set for a specific alarm for the alarm action to use a different SNS topic.
import { App, Stack, Aspects, aws_lambda as lambda } from 'aws-cdk-lib';
import * as recommendedalarms from '@renovosolutions/cdk-library-cloudwatch-alarms';

const app = new App();
const stack = new Stack(app, 'TestStack', {
env: {
account: '123456789012',
region: 'us-east-1',
},
});

const stack2 = new Stack(app, 'TestStack2', {
env: {
account: '123456789012',
region: 'us-east-1',
},
});

const alarmTopic = new sns.Topic(stack, 'Topic');
const topicAction = new cloudwatch_actions.SnsAction(alarmTopic)

const alarmTopic2 = new sns.Topic(stack, 'Topic');
const topicAction2 = new cloudwatch_actions.SnsAction(alarmTopic2)

const appAspects = Aspects.of(app);

appAspects.add(
new recommendedalarms.LambdaRecommendedAlarmsAspect({
defaultAlarmAction: topicAction,
defaultOkAction: topicAction,
defaultInsufficientDataAction: topicAction,
configDurationAlarm: {
threshold: 15,
alarmAction: topicAction2,
},
configErrorsAlarm: {
threshold: 1,
},
configThrottlesAlarm: {
threshold: 0,
},

}),
);

new lambda.Function(stack, 'Lambda', {
runtime: lambda.Runtime.NODEJS_20_X,
handler: 'index.handler',
code: lambda.Code.fromInline('exports.handler = async (event) => { console.log(event); }'),
});

new lambda.Function(stack2, 'Lambda2', {
runtime: lambda.Runtime.NODEJS_20_X,
handler: 'index.handler',
code: lambda.Code.fromInline('exports.handler = async (event) => { console.log(event); }'),
});

Exclusions
You can exclude specific alarms or specific resources. Alarms use the available metrics enums and resources use the string used for a resources id. For example below Lambda1 will not have alarms created and there will be no alarm for the Duration metric for either lambda function.
import { App, Stack, Aspects, aws_lambda as lambda } from 'aws-cdk-lib';
import * as recommendedalarms from '@renovosolutions/cdk-library-cloudwatch-alarms';

const app = new App();
const stack = new Stack(app, 'TestStack', {
env: {
account: '123456789012', // not a real account
region: 'us-east-1',
},
});

const appAspects = Aspects.of(app);

appAspects.add(
new recommendedalarms.LambdaRecommendedAlarmsAspect({
excludeResources: ['Lambda1'],
excludeAlarms: [recommendedalarms.LambdaRecommendedAlarmsMetrics.DURATION],
configDurationAlarm: {
threshold: 15,
},
configErrorsAlarm: {
threshold: 1,
},
configThrottlesAlarm: {
threshold: 0,
},
}),
);

new lambda.Function(stack, 'Lambda1', {
runtime: lambda.Runtime.NODEJS_20_X,
handler: 'index.handler',
code: lambda.Code.fromInline('exports.handler = async (event) => { console.log(event); }'),
});

new lambda.Function(stack, 'Lambda2', {
runtime: lambda.Runtime.NODEJS_20_X,
handler: 'index.handler',
code: lambda.Code.fromInline('exports.handler = async (event) => { console.log(event); }'),
});

References

AWS Recommended Alarms
Aspects and the AWS CDK