as discovered in T89846 there is signifcant udp packet loss on graphite1001 but no loss reported in the relevant dashboard at http://gdash.wikimedia.org/dashboards/graphite/ summarizing diamond's tx_drop and rx_drop network metrics
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the reason for this is that the network collector is separate from ip/tcp/udp collectors which would have been the right thing in this case, since enabling those collector will push a significant amount of metrics we have to figure out statsd first in T90111
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no reason to enable udp collector across the board, we can selectively enable it for machines with udp services (likewise tcp)