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When the metrics are dumped, in the main function promex_dump_metrics(), the appctx flags are set before entering in a new scope, among others things to know which metrics names and descriptions to use. But, those flags are not restored when the dump is interrupted because of a full output buffer. If this happens after the dump of global metrics, it may only lead to extra #TYPE and #HELP lines. But if this happens during the dump of global metrics, the following dumps of frontends, backends and servers metrics use names and descriptions of global ones with the unmatching indexes. This first leads to unexisting metrics names. For instance, "haproxy_frontend_nbproc". But also to out-of-bound accesses to name and description arrays because there are more stats fields than info fields. It is easy to reproduce the bug using small buffers, setting tune.bufsize to 8192 for instance. This patch should fix the issue #666. It must be backported as far as 2.0.
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)