Attribution and Licensing
pig.center republishes documentation written by six upstream projects. Every documentation page carries a one-line credit at the end naming the work it is derived from, its copyright holder, its licence, and a link back to the section of this page that covers it.
This page is that record. It states what was imported, when, from which pinned revision, under which licence, and where the complete upstream notice is retained.
English, Simplified Chinese, and French cover all six collections. Japanese, German, and Russian publish the translations already completed; links to missing translations fall back to the corresponding English page.
pig.center is an independent community documentation project. It is not affiliated with, endorsed by, or an official publication of any of the projects below, nor of the PostgreSQL Global Development Group.
Summary
| Component | Upstream work | Pinned at | Licence | Retained notice |
|---|---|---|---|---|
| Patroni | Patroni documentation | v4.1.5 | MIT | Upstream LICENSE |
| pgBackRest | pgBackRest documentation | v2.59.1 | MIT | Upstream LICENSE |
| PgBouncer | PgBouncer documentation | v1.25.2 | ISC | Upstream COPYRIGHT |
| pgBadger | pgBadger documentation | v13.2, commit a1ad95a | PostgreSQL | /third_party/pgbadger/LICENSE |
| HAProxy | HAProxy 3.4 manuals | v3.4.4, commit 7f03ae6 | GPL-2.0 | /third_party/haproxy/LICENSE |
| etcd | etcd v3.7 documentation | v3.7, commit 8245979 | CC BY 4.0 | Upstream LICENSE |
Every collection is adapted, not mirrored. Headings, anchors, cross-links, code signatures, page grouping, and navigation are reworked for this edition; the upstream prose itself is preserved. The page-end credit says so, and links to this site’s change history for the page you are reading.
Patroni
Imported on 2026-08-15 from the Patroni documentation for v4.1.5, with a Simplified Chinese translation prepared alongside it.
Patroni is copyright (c) 2025 Compose, Zalando SE, Patroni Contributors, and is distributed under the MIT License . The complete licence text is retained upstream .
pgBackRest
Imported on 2026-08-15 and refreshed on 2026-08-30 from the pgBackRest documentation site for v2.59.1, with a Simplified Chinese translation maintained alongside it.
pgBackRest is copyright (c) 2015-2026 The PostgreSQL Global Development Group and David Steele, and is distributed under the MIT License . The complete licence text is retained upstream .
PgBouncer
Imported on 2026-08-15 from the PgBouncer documentation site for v1.25.2, with a Simplified Chinese translation prepared alongside it.
PgBouncer is copyright (c) 2007-2009 Marko Kreen, Skype Technologies OÜ, and is distributed under the ISC License . The complete licence text is retained upstream .
pgBadger
Imported on 2026-08-15 from https://pgbadger.darold.net/
and from
darold/pgbadger
at commit
a1ad95a
,
whose latest published release at the time was v13.2.
pgBadger is copyright (c) 2012-2026 Gilles Darold and is distributed under the
PostgreSQL License
. The complete licence text is
retained beside the offline examples as
/third_party/pgbadger/LICENSE
and in
sources/pgbadger/upstream/LICENSE in the site repository.
pgBadger embeds a modified SQL::Beautify module under Artistic License 2.0, and its
generated-report resources include MIT, GPL-2.0, and SIL Open Font License 1.1 components. The
complete upstream resource inventory is retained as
/third_party/pgbadger/THIRD-PARTY-LICENSES
.
The sample reports
published here are historical generated
artifacts and keep their original embedded notices.
HAProxy
Imported on 2026-08-16 and refreshed on 2026-08-30 from the official HAProxy 3.4 maintenance
repository at tag v3.4.4, commit
7f03ae65c286
.
The English prose is derived from the complete doc/intro.txt, doc/configuration.txt, and
doc/management.txt manuals — 40,128 lines in total — reorganized into 34 reading pages.
HAProxy is copyright 2000-2026 Willy Tarreau and is distributed under the
GNU General Public License version 2
.
HAProxy’s own licence explanation, its OpenSSL exception, and the complete GPLv2 text are
published as /third_party/haproxy/LICENSE
and
/third_party/haproxy/GPL-2.0
.
The HAProxy-derived pages are not covered by this site’s CC BY 4.0 licence. They carry HAProxy’s GPLv2 terms.
etcd
Imported from the official etcd v3.7 documentation and refreshed on 2026-08-30 at commit
824597935df6
.
The pinned source tree is
content/en/docs/v3.7
.
The etcd documentation is copyright 2013-present etcd Authors. Its prose is licensed under CC BY 4.0 , while code and code samples are licensed under Apache 2.0 . The complete notice is retained upstream .
This site
Original text written for pig.center — orientation pages, the complete Simplified Chinese and French editions, the published Japanese, German, and Russian translations, editorial notes, and the landing pages — is published under CC BY 4.0 , except where an upstream licence above applies to the page instead.
The PostgreSQL elephant (Slonik) shown on the home page is the PostgreSQL project’s own mark, taken from the postgresql.org website repository and republished here unmodified under the PostgreSQL trademark and logo policy as a reference to PostgreSQL. It is a mark of the PostgreSQL Community Association of Canada and its use here does not imply endorsement.
The site is built with OINK v1.0.0, a Hugo theme licensed under the Apache License 2.0 , which carries its own upstream and bundled-dependency notices in the module source.
Corrections to any attribution on this page are welcome through the site repository .