prometheus output for topN is repeating help message, breaking scrapers #143
Description
The help message is repeated for each item in the top list, rather than once for the metric
# HELP dns_top_udp_ports Top UDP source port on the query side of a transaction
# TYPE dns_top_udp_ports gauge
dns_top_udp_ports{instance="gw",name="51837"} 2
# HELP dns_top_udp_ports Top UDP source port on the query side of a transaction
# TYPE dns_top_udp_ports gauge
dns_top_udp_ports{instance="gw",name="35247"} 2
# HELP dns_top_udp_ports Top UDP source port on the query side of a transaction
# TYPE dns_top_udp_ports gauge
dns_top_udp_ports{instance="gw",name="46746"} 2
# HELP dns_top_udp_ports Top UDP source port on the query side of a transaction
# TYPE dns_top_udp_ports gauge
should be
# HELP dns_top_udp_ports Top UDP source port on the query side of a transaction
# TYPE dns_top_udp_ports gauge
dns_top_udp_ports{instance="gw",name="51837"} 2
dns_top_udp_ports{instance="gw",name="35247"} 2
dns_top_udp_ports{instance="gw",name="46746"} 2