vhostmap Prometheus metric has duplicate entries
Starting with bookworm, the node-exporter complains, and they're right:
# grep docker-wayback-http.service vhostmap.prom
vhostmap{float_service="wayback",service="docker-wayback-http.service",vhost="archive.autistici.org:443"} 1
vhostmap{float_service="wayback",service="docker-wayback-http.service",vhost="archive.inventati.org:443"} 1
vhostmap{float_service="wayback",service="docker-wayback-http.service",vhost="archive.autistici.org:443"} 1
vhostmap{float_service="wayback",service="docker-wayback-http.service",vhost="archive.inventati.org:443"} 1
vhostmap{float_service="wayback",service="docker-wayback-http.service",vhost="archive.autistici.org:443"} 1
vhostmap{float_service="wayback",service="docker-wayback-http.service",vhost="archive.inventati.org:443"} 1