Monitoring HA Proxy

Introduced in GitLab 9.4

GitLab has support for automatically detecting and monitoring HA Proxy. This is provided by leveraging the HA Proxy Exporter, which translates HA Proxy statistics into a Prometheus readable form.

Metrics supported

Name	Query
Throughput (req/sec)	sum(rate(haproxy_frontend_http_requests_total{%{environment_filter}}[2m]))
HTTP Error Rate (%)	sum(rate(haproxy_frontend_http_requests_total{code="5xx",%{environment_filter}}[2m])) / sum(rate(haproxy_frontend_http_requests_total{%{environment_filter}}[2m]))

Configuring Prometheus to monitor for HA Proxy metrics

To get started with NGINX monitoring, you should install and configure the HA Proxy exporter which parses these statistics and translates them into a Prometheus monitoring endpoint.

Specifying the Environment label

In order to isolate and only display relevant metrics for a given environment however, GitLab needs a method to detect which labels are associated. To do this, GitLab will look for an environment label.