And this little gem of an article has helped me build a custom
node-exporter
Docker image where I can now correctly show the hostnames of my Docker nodes in Grafana graphs using expressions like:
sum((node_memory_MemAvailable_bytes{job="docker_nodes"} / node_memory_MemTotal_bytes{job="docker_nodes"} * 100) * on(instance) group_left(node_id, node_name) node_meta) by (node_id, node_name)
e.g: