Use of gl2_accounted_message_size for measuring outgoing traffic

Pretty freakin amazing :+1:

EDIT:
Oh I see, I must have missed that, good catch

> db.traffic.find().Prtty()
uncaught exception: TypeError: db.traffic.find(...).Prtty is not a function :
@(shell):1:1
> db.traffic.find().pretty()
{
        "_id" : ObjectId("5a501e28e433355eb03b71e3"),
        "bucket" : ISODate("2018-01-06T00:00:00Z"),
        "decoded" : {
                "c7f567fc-5ff7-459c-99f2-bf088359cd7a" : NumberLong(0)
        },
        "output" : {
                "c7f567fc-5ff7-459c-99f2-bf088359cd7a" : NumberLong(0)
        },
        "input" : {
                "c7f567fc-5ff7-459c-99f2-bf088359cd7a" : NumberLong(0)
        }
}
{
        "_id" : ObjectId("5a501fcce433355eb03b71ea"),
        "bucket" : ISODate("2018-01-06T01:00:00Z"),
        "decoded" : {
                "c7f567fc-5ff7-459c-99f2-bf088359cd7a" : NumberLong(72924857)
        },
        "output" : {
                "c7f567fc-5ff7-459c-99f2-bf088359cd7a" : NumberLong(74002963)
        },
        "input" : {
                "c7f567fc-5ff7-459c-99f2-bf088359cd7a" : NumberLong(62913272)
        }
}
{
        "_id" : ObjectId("5a502ddc706123b67ae965d4"),
        "bucket" : ISODate("2018-01-06T02:00:00Z"),
        "decoded" : {
                "c7f567fc-5ff7-459c-99f2-bf088359cd7a" : NumberLong(95324686)
        },
        "output" : {