MINOR: promex: introduce haproxy_backend_agg_check_status

This patch introduces haproxy_backend_agg_check_status metric
as we wanted in 42d7c402d but with the right data source.

This patch could be backported as far as 2.4.

(cherry picked from commit e06e31ea3b62ef8ccb911ac3969ae70f7bbb7574)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
(cherry picked from commit f0319e0f56581873f906f79dc218bf6f10b8f6c2)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
(cherry picked from commit d8567a9fea61ae0ab0019a7cc563961e7afc34ad)
[cf: Adapted because the appctx was refactored in 2.6]
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
(cherry picked from commit 67cd53b415f2f411dfebe2024d0b480e740be258)
Signed-off-by: Christopher Faulet <cfaulet@haproxy.com>
3 files changed