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[tor-dev] CollecTor will soon serve descriptors that don't pass metrics-lib's parser

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Hello CollecTor data consumers,

note: if you don't know what CollecTor is or if you have never used
CollecTor data before, you can safely stop reading now and enjoy your
Friday.  But in case you're now curious what CollecTor is, feel free
to take a look:

https://collector.torproject.org/

So, we're about to remove a sanity check in CollecTor where we'd feed
relay descriptors into metrics-lib and only serve them if they pass
the parsing step.  This step has so far eliminated descriptors with
non-ASCII characters in unexpected places, like:

dirreq-v3-ips
us=192,ru=144,de=136,??=112,fr=64,gb=56,br=40,it=40,es=24,in=24,jp=24,pl=24,ar=16,at=16,au=16,ca=16,ch=16,cn=16,cz=16,ir=16,kr=16,mx=16,nl=16,ua=16,za=16,^Wg=8,ae=8,ao=8,be=8,bg=8,bj=8,bo=8,bs=8,bw=8,by=8,cd=8,cl=8,cm=8,co=8,cr=8,cu=8,dd=8,dk=8,du=8,dz=8,ec=8,eg=8,fi=8,gf=8,gh=8,gr=8,gt=8,hk=8,hn=8,hr=8,hu=8,id=8,ie=8,il=8,i�=8,ke=8,kz=8,lk=8,lt=8,lv=8,ly=8,ma=8,md=8,mk=8,mu=8,my=8,nc=8,ng=8,ni=8,no=8,nz=8,pa=8,pe=8,ph=8,pk=8,pr=8,pt=8,ro=8,rs=8,se=8,sg=8,sk=8,sn=8,sy=8,th=8,tn=8,tr=8,tw=8,ug=8,ve=8,vn=8,�p=8

Very soon (next week?), CollecTor will serve those descriptors, just
like the Tor directory authorities serve them.

If you're obtaining and processing descriptors from CollecTor, you'll
somehow have to handle them.  Of course, if you're using metrics-lib,
nothing changes, and I hear Stem discards descriptors with non-ASCII
characters in the line above, too.

If you want, you can find more details on the ticket:

https://trac.torproject.org/projects/tor/ticket/19170

All the best,
Karsten
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