Add prometheus-exporter to HAProxy

[rfvbkm]

As of 2.0.0, HAProxy includes a Prometheus exporter module that can be built into a binary during build time.

To build with the official Prometheus exporter module, make should be run with the following EXTRA_OBJS flag:
make TARGET=linux-glibc EXTRA_OBJS="contrib/prometheus-exporter/service-prometheus.o"
Once built, prometheus-exporter can be enabled in haproxy.cfg:

listen stats
  bind 0.0.0.0:9090
  balance
  mode http
  stats enable
  http-request use-service prometheus-exporter if { path /metrics }

For more infromation, see this official blog post

[mesosphere-ci]

Can one of the admins verify this patch?

[mesosphere-ci]

Can one of the admins verify this patch?

[mesosphere-ci]

Can one of the admins verify this patch?

[mesosphere-ci]

Can one of the admins verify this patch?

[jkoelker]

ok to test

[jkoelker]

\o/ Thanks for the addition. Sorry for the delay in getting this merged.

[harryge00]

Will this be released in v1.14.3?