Deploy the demo to your AWS account using AWS SAM.

mvn clean package
sam deploy -g

This will create a kinesis stream and a Lambda function reading from it.

You can add records to the Kinesis stream using below cli. It will add a record with the current date.

aws kinesis put-record --stream-name sam-app-stream-zzzzzzzzz   --data `date|base64` --partition-key `uuidgen`

You will need to update the application.properties file to connect your own database.

Using this CloudWatch Logs Insights query you can analyse the latency of the requests made to the Lambda functions.

The query separates cold starts from other requests and then gives you p50, p90 and p99 percentiles.

filter @type="REPORT"
| fields greatest(@initDuration, 0) + @duration as duration, ispresent(@initDuration) as coldStart
| stats count(*) as count, pct(duration, 50) as p50, pct(duration, 90) as p90, pct(duration, 99) as p99, max(duration) as max by coldStart

Latency for JVM version:

Latency for GraalVM version:

You can add additional detail to your X-Ray tracing by adding a TracingInterceptor to your AWS SDK clients.

Example cold start trace for JVM version: