Docker Volume Size Metrics for Prometheus

Wrote a little script recently to send volume size metrics to prometheus. I’m already using cadvisor which provides a container_fs_usage_bytes metric with labels for container_label_com_docker_compose_project and container_label_com_docker_compose_service, but I wanted a bit more detail on where data was being used.

The script is run every minute by cron and writes the metrics to the path used by node_exporter.

* * * * * | sponge /docker-volumes.prom

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