Monitoring HAProxy
Introduced in GitLab 9.4
GitLab has support for automatically detecting and monitoring HAProxy. This is provided by leveraging the HAProxy Exporter, which translates HAProxy statistics into a Prometheus readable form.
Requirements
The Prometheus service must be enabled.
Metrics supported
| Name | Query |
|---|---|
| Throughput (req/sec) | sum(rate(haproxy_frontend_http_requests_total{%{environment_filter}}[2m])) by (code) |
| 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 HAProxy metrics
To get started with NGINX monitoring, you should install and configure the HAProxy 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 looks for an environment label.