Fix the error logging of the promhttp handler by connecting it to the
promlog setup.
* Switch to go-kit/log.
* Cleanup CHANGELOG.
Fixes: https://github.com/prometheus/node_exporter/issues/1886
Signed-off-by: Ben Kochie <superq@gmail.com>
Based on the solaris implementation. There's a lot of other sysctls
available on FreeBSD that aren't reported here. It'll be easy to add,
if they're useful. All of the sysctls are uint64.
Signed-off-by: Derek Marcotte <554b8425@razorfever.net>
