I'm no longer maintaining this repository as I'm no longer using Unbound.
As the container is built from sources, keeping it up to date shouldn't be too hard.
This is a Docker container running an unbound exporter for Prometheus.
The actual exporter code is https://github.com/kumina/unbound_exporter
It's based on golang:alpine as a stage 1 image and alpine as the clean environment.
Health check is done via curl.