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Due to a recent change in the handling of haproxy variables, their use for OpenTracing context transfer has been excluded from the compilation process. The use of variables can be re-enabled if the newly defined variable OT_USE_VARS is set to 1 when calling the 'make' utility. However, this should not be used for now as the compilation will end in error. This change prevents the use of haproxy variables to convey the OpenTracing context. This means that the 'use-vars' parameter cannot be used in the OpenTracing filter configuration for 'inject' and 'extract' operations. An example configuration that uses this feature is in the test/ctx directory, while the script to run that test is test/run-ctx.sh. Then, the 'sess.ot.uuid' variable is no longer set when initializing the OpenTracing session. This means that this variable can still be used in the OpenTracing configuration, but its contents will be empty.
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)