docs: Improve examples/cdk/README.md (#467)

* Improve examples/cdk/README.md

* Address PR comments on README update

* Addres PR comments #2

examples/cdk/README.md

@@ -1,14 +1,24 @@
-# Welcome to your CDK TypeScript project!
+# AWS Lambda Powertools (TypeScript) examples in CDK
 
-This is a blank project for TypeScript development with CDK.
+This is a deployable CDK app that deploys AWS Lambda functions as part of a CloudFormation stack. These Lambda functions use the utilities made available as part of AWS Lambda Powertools (TypeScript) to demonstrate their usage.
 
-The `cdk.json` file tells the CDK Toolkit how to execute your app.
+You will need to have a valid AWS Account in order to deploy these resources. These resources may incur costs to your AWS Account. The cost from **some services** are covered by the [AWS Free Tier](https://aws.amazon.com/free/?all-free-tier.sort-by=item.additionalFields.SortRank&all-free-tier.sort-order=asc&awsf.Free%20Tier%20Types=*all&awsf.Free%20Tier%20Categories=*all) but not all of them. If you don't have an AWS Account follow [these instructions to create one](https://aws.amazon.com/premiumsupport/knowledge-center/create-and-activate-aws-account/).
 
-## Useful commands
+The example functions, located in the `lib` folder, are invoked automatically, twice, when deployed using the CDK construct defined in `lib/example-function.ts`. The first invocation demonstrates the effect on logs/metrics/annotations when the Lambda function has a cold start, and the latter without a cold start.
 
- * `npm run build`   compile typescript to js
- * `npm run watch`   watch for changes and compile
- * `npm run test`    perform the jest unit tests
- * `cdk deploy`      deploy this stack to your default AWS account/region
- * `cdk diff`        compare deployed stack with current state
- * `cdk synth`       emits the synthesized CloudFormation template
+## Deploying the stack
+
+ * Ensure that CDK v2 is installed globally on your machine (if not, run `npm install -g aws-cdk`)
+ * Navigate to this location of the repo in your terminal (`examples/cdk`)
+ * `npm install`
+ * `cdk deploy --all --profile <YOUR_AWS_PROFILE>`
+
+Note: Prior to deploying you may need to run `cdk bootstrap aws://<YOU_AWS_ACCOUNT_ID>/<AWS_REGION> --profile <YOUR_AWS_PROFILE>` if you have not already bootstrapped your account for CDK.
+
+## Viewing Utility Outputs
+
+All utility outputs can be viewed in the Amazon CloudWatch console.
+
+ * `Logger` output can be found in Logs > Log groups
+ * `Metrics` output can be found in Metrics > All metrics > CdkExample
+ * `Tracer` output can be found in  X-Ray traces > Traces

examples/cdk/bin/cdk-app.ts

@@ -4,4 +4,4 @@ import * as cdk from 'aws-cdk-lib';
 import { CdkAppStack } from '../lib/example-stack';
 
 const app = new cdk.App();
-new CdkAppStack(app, 'CdkAppStack', {});
+new CdkAppStack(app, 'LambdaPowertoolsTypeScript-ExamplesCdkStack', {});

packages/metrics/src/Metrics.ts

@@ -210,7 +210,7 @@ class Metrics implements MetricsInterface {
    * import { Metrics, MetricUnits } from '@aws-lambda-powertools/metrics';
    * import { Callback, Context } from 'aws-lambda';
    *
-   * const metrics = new Metrics({namespace:"CDKExample", serviceName:"withDecorator"});
+   * const metrics = new Metrics({namespace:"CdkExample", serviceName:"withDecorator"});
    *
    * export class MyFunctionWithDecorator {
    *
@@ -267,7 +267,7 @@ class Metrics implements MetricsInterface {
    * ```typescript
    * import { Metrics, MetricUnits } from '@aws-lambda-powertools/metrics';
    *
-   * const metrics = new Metrics({namespace: "CDKExample", serviceName: "MyFunction"}); // Sets metric namespace, and service as a metric dimension
+   * const metrics = new Metrics({namespace: "CdkExample", serviceName: "MyFunction"}); // Sets metric namespace, and service as a metric dimension
    *
    * export const handler = async (_event: any, _context: any) => {
    *   metrics.addMetric('test-metric', MetricUnits.Count, 10);

packages/metrics/tests/e2e/decorator.test.MyFunction.ts

@@ -2,7 +2,7 @@ import { Metrics, MetricUnits } from '../../src';
 import { Context } from 'aws-lambda';
 import { LambdaInterface } from '../../examples/utils/lambda/LambdaInterface';
 
-const namespace = process.env.EXPECTED_NAMESPACE ?? 'CDKExample';
+const namespace = process.env.EXPECTED_NAMESPACE ?? 'CdkExample';
 const serviceName = process.env.EXPECTED_SERVICE_NAME ?? 'MyFunctionWithStandardHandler';
 const metricName = process.env.EXPECTED_METRIC_NAME ?? 'MyMetric';
 const metricUnit = (process.env.EXPECTED_METRIC_UNIT as MetricUnits) ?? MetricUnits.Count;

packages/metrics/tests/e2e/standardFunctions.test.MyFunction.ts

@@ -1,7 +1,7 @@
 import { Metrics, MetricUnits } from '../../src';
 import { Context } from 'aws-lambda';
 
-const namespace = process.env.EXPECTED_NAMESPACE ?? 'CDKExample';
+const namespace = process.env.EXPECTED_NAMESPACE ?? 'CdkExample';
 const serviceName = process.env.EXPECTED_SERVICE_NAME ?? 'MyFunctionWithStandardHandler';
 const metricName = process.env.EXPECTED_METRIC_NAME ?? 'MyMetric';
 const metricUnit = (process.env.EXPECTED_METRIC_UNIT as MetricUnits) ?? MetricUnits.Count;