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Buildfarm members kittiwake, tadarida and snapper began to fail frequently when commits 3cd9c3b921977272e6650a5efbeade4203c4bca2 and f47ed79cc8a0cfa154dc7f01faaf59822552363f added tests of concurrency, but the problem was reachable before those commits. Back-patch to v10 (all supported versions). Discussion: https://postgr.es/m/20220116210241.GC756210@rfd.leadboat.com
The PostgreSQL contrib tree --------------------------- This subtree contains porting tools, analysis utilities, and plug-in features that are not part of the core PostgreSQL system, mainly because they address a limited audience or are too experimental to be part of the main source tree. This does not preclude their usefulness. User documentation for each module appears in the main SGML documentation. When building from the source distribution, these modules are not built automatically, unless you build the "world" target. You can also build and install them all by running "make all" and "make install" in this directory; or to build and install just one selected module, do the same in that module's subdirectory. Some directories supply new user-defined functions, operators, or types. To make use of one of these modules, after you have installed the code you need to register the new SQL objects in the database system by executing a CREATE EXTENSION command. In a fresh database, you can simply do CREATE EXTENSION module_name; See the PostgreSQL documentation for more information about this procedure.