MINOR: contrib/prometheus-exporter: use stats desc when possible

It is a followup work of commit a191b77e54c26a97064cb42ab4927d4f5c95b896
("MINOR: contrib/prometheus-exporter: merge info description from
stats") but for all other stats fields; we however keep a way to
override them when needed (e.g. units, specific cases)

this is another step which will avoid duplicating work between stats.c
and prometheus.

Signed-off-by: William Dauchy <wdauchy@gmail.com>
1 file changed