This is a prototype app designed to be run on AWS Lambda. It demonstrates how to configure a Scala application to write JSON-formatted logs.

It was built to help us work out how to save logs on the Transfer Digital Records project.

The application just writes logs at a variety of log levels. Some log messages include exceptions, and some include extra custom fields.

It uses the logstash-logback-encoder to write the logs as JSON. See the logback.xml for the JSON log configuration.

Run sbt run, or run the LambdaLoggingApp object in IntelliJ.

• Run sbt assembly, which generates a file at target/scala-2.13/example-lambda-logging.jar
• Create a new Lambda function in AWS which uses the Java runtime
• Upload the jar file to the Lambda
• Create a test event to send to the Lambda - the app doesn't actually use this event, so the contents can be anything. The default 'Hello world' message is fine.
• Send the test event to the Lambda
• Inspect the logs in the CloudWatch log group