I committed a new Munin-plugin for HAProxy. It’s a multigraph plugin, it discovers all the configured frontends and backends automatically – all you need to provide is the username/password for the haproxy status page.
It produces 8 graphs, + subgraphs for some of the backends, where it presents the same graphs, but with server-specific metrics.
Some of the root-graphs:
Do you use HAProxy and Munin? Check it out!