tree 08bc0d64351b6fddceae653423e0622eb7f8c074
parent 27c70ae23c1f5b39c9757387559072a096c8aa8c
author William Dauchy <wdauchy@gmail.com> 1611592141 +0100
committer Christopher Faulet <cfaulet@haproxy.com> 1611649459 +0100

MEDIUM: stats: allow to select one field in `stats_fill_be_stats`

prometheus approach requires to output all values for a given metric
name; meaning we iterate through all metrics, and then iterate in the
inner loop on all objects for this metric.
In order to allow more code reuse, adapt the stats API to be able to
select one field or fill them all otherwise.
This patch follows what has already been done on frontend side.
From this patch it should be possible to remove most of the duplicate
code on prometheuse side for the backend

A few things to note though:
- status and uweight field requires prior compute, so I moved that to a
  sort of helper `stats_fill_be_stats_computesrv`.
- all ST_F*TIME fields requires some minor compute, so I moved it at te
  beginning of the function under a condition.

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