[tor-bugs] #16424 [metrics-lib]: Support parsing of .xz compressed tarballs

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#16424: Support parsing of .xz compressed tarballs
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 Reporter:  karsten      |          Owner:  karsten
     Type:  enhancement  |         Status:  new
 Priority:  normal       |      Milestone:
Component:  metrics-lib  |        Version:
 Keywords:               |  Actual Points:
Parent ID:               |         Points:
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 We switched from providing .tar.bz2 files on CollecTor to .tar.xz around
 July or August 2014, but we never updated metrics-lib to parse those.

 We should try out how slow parsing .xz compressed tarballs is compared to
 uncompressed tarballs.  Maybe the better plan is to put out a big warning
 and suggest that users decompress themselves using the `unxz` tool.

 When we add support for this, let's try not to add any new dependencies to
 metrics-lib.

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/16424>
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