Yeah, I was writing a Docker image built around Prometheus' jmx_exporter intended to be used as a mixin for our Java apps, and part of what I needed to do was provide a simple script to preprocess separate config files to produce the config used by jmx_exporter.

My initial thought was Python, but it needed a couple of 3rd party dependencies, and there wasn't an overly clean _and_ simple way to copy the script in from the mixin and run locally.

So I shrugged, rewrote my script in Go, and then used a multi-stage build to copy in the binary and nothing else.

Ending up with a single statically linked binary was cool, even if Go does some stuff that made my eyebrows quirk a tad (I still can't believe that an idiomatic set in Go is map[T]struct{}...)