Logging

The simplest way to log from your Nebula scripts is using plain old Kotlin:

println("Hello world!")

This will appear in the logs from your CLI or Docker container, depending on how Nebula was launched.

Writing structured log messages

Each DSL has an optional Loggerinstance provided:

stack {
    kafka { logger ->
        producer("100ms".duration(), "stockQuotes") {
            jsonMessage {
                logger.info("This message logs whenever a jsonMessage is emitted")
                // other stuff
            }
       }
    }
}

Logs from containers (Nebula Desktop)

The logs from containers are captured and made available in Nebula Desktop