mikar [1] filed a orphan request for sonarqube-lts [2]:
Hasn't been updated in 6 months.
Also, since 03.06.2016, there has been a change in the LTS branch so
that currently the latest lts release is release is identical to the
latest available version (5.6 from 03.06.2016).
This version is very outdated.
[1] https://aur.archlinux.org/account/mikar/
[2] https://aur.archlinux.org/pkgbase/sonarqube-lts/