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Now, the prometheus exporter parses the HTTP query-string to filter or to adapt the exported metrics. In this first version, it is only possible select the scopes of metrics to export. To do so, one or more parameters with "scope" as name must be passed in the query-string, with one of those values: global, frontend, backend, server or '*' (means all). A scope parameter with no value means to filter out all scopes (nothing is returned). The scope parameters are parsed in their appearance order in the query-string. So an empty scope will reset all scopes already parsed. But it can be overridden by following scope parameters in the query-string. By default everything is exported. The filtering can also be done on prometheus scraping configuration, but general aim is to optimise the source of data to improve load and scraping time. This is particularly true for huge configuration with thousands of backends and servers. Also note that this configuration was possible on the previous official haproxy exporter but with even more parameters to select the needed metrics. Here we thought it was sufficient to simply avoid a given type of metric. However, more filters are still possible. Thanks to William Dauchy. This patch is based on his work.
The HAProxy documentation has been split into a number of different files for ease of use. Please refer to the following files depending on what you're looking for : - INSTALL for instructions on how to build and install HAProxy - BRANCHES to understand the project's life cycle and what version to use - LICENSE for the project's license - CONTRIBUTING for the process to follow to submit contributions The more detailed documentation is located into the doc/ directory : - doc/intro.txt for a quick introduction on HAProxy - doc/configuration.txt for the configuration's reference manual - doc/lua.txt for the Lua's reference manual - doc/SPOE.txt for how to use the SPOE engine - doc/network-namespaces.txt for how to use network namespaces under Linux - doc/management.txt for the management guide - doc/regression-testing.txt for how to use the regression testing suite - doc/peers.txt for the peers protocol reference - doc/coding-style.txt for how to adopt HAProxy's coding style - doc/internals for developer-specific documentation (not all up to date)