[metrics-team] Sonarqube on metrics-lib

[fava]

Hi,

fava:
> Hi Karsten,
> 
> Karsten Loesing:
>> Hi Fava,
> ...
>> You could start a new Trac ticket for each issue type and attach a patch
>> for one instance or link to your GitHub task branch, and then we would
>> discuss whether that's a good fix in our situation. Does this make sense?
> Yes, it make sense to me.
> So I created the first issue on trac system [1] (Using
> try-with-resources or close resource) but I cannot change status to in
> progress or assign to me.
> Probably I will attach a patch file to trac system when I have done.

I finished my first patch and I have attached a zip file to trac system [1].

Please let me know your code review,

Best Regards
fava

~~~
[1] https://trac.torproject.org/projects/tor/ticket/30544