[crabbone]

Nothing will go to stdout! Nothing is the best thing you can have when it comes to program output. Easiest validation! This is also how all Unix commands work -- they don't write to stdout unless you tell them to. But, if there's nothing extraordinary happening during the program execution -- nothing is written.

But why would you write your own logs instead of using something built into your language's library? I believe Python's logging module writes to stderr by default. Go's log package always goes to stderr.

But... today I've learned that console.log() in NodeJS writes to stdout... well, I've lots another tiny bit of faith in humanity.

[FridgeSeal]

> This is also how all Unix commands work -- they don't write to stdout unless you tell them to

Ok? But as per my other comment, I’m not writing CLI apps, it’s mostly services and I have supporting services which harvest the logs from each containers stdout.

> But why would you write your own logs instead of using something built into your language's library?

I’m not writing my own logging setup? I am using the provided tools?? Every language logging library I’ve ever used writes to stdout?

Structlog in Python, nodejs obvs, all the Rust logging libraries I’ve ever used, I know you can configure Java/scala 3 million different ways (hello yes log4j lol), but all the Spark stuff I’ve written has logged to stdout.