core/homeassistant/components/lidarr/icons.json

{
  "entity": {
    "sensor": {
      "disk_space": {
        "default": "mdi:harddisk"
      },
      "queue": {
        "default": "mdi:download"
      },
      "wanted": {
        "default": "mdi:music"
      }
    }
  }
}