Does the docker icon label have other requirements? The WebUI label looks to work great, but icons are still the gray question marks for containers created by Docker Compose.
Example config:
version: "2"
services:
sonarr:
image: "linuxserver/sonarr:latest"
labels:
net.unraid.docker.webui: "https://sonarr.example.com"
net.unraid.docker.icon: https://raw.githubusercontent.com/binhex/docker-templates/master/binhex/images/sonarr-icon.png