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ST_F_CHECK_DURATION metric is typed as unsigned int variable, and it is derived from check->duration that is signed. While most of the time check->duration > 0, it is not always true: with HCHK_STATUS_HANA checks, check->duration is set to -1 to prevent server logs from including irrelevant duration info (HCHK_STATUS_HANA checks are not time related). Because of this, stats could report UINT64_MAX value for ST_F_CHECK_DURATION metric. This was quite confusing. To prevent this, we make sure not to assign negative value to ST_F_CHECK_DURATION. This is only a minor printing issue, not backport needed.
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)