HAProxy is an Open Source proxy application for TCP and HTTP-based applications, and also provides a highly available load balancer.
The project, published by Willy Tarreau on December 16, 2001, has made a name for itself with its fast and efficient operation.
The frequent integration of HAProxy in enterprise-like infrastructures is making the issue of monitoring increasingly important in this respect.
Various applications offer associated solutions, such as HATop, an Open Source application, or Datadog, the commercial counterpart.