[pgpool-committers: 6649] pgpool: Allow to set application name parameter of log_line_prefix in m

[Tatsuo Ishii]

Allow to set application name parameter of log_line_prefix in more cases.

%a in log_line_prefix was only be set if application_name is specified
 in startup message. Now it is possible to set application_name if it
 is set in the connection parameter or SET command.

Also set hard coded application_name in various internal process so
that admins can easily recognize each log line belonging to which
process.

Discussion: https://www.pgpool.net/pipermail/pgpool-hackers/2020-April/003572.html

Branch
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master

Details
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https://git.postgresql.org/gitweb?p=pgpool2.git;a=commitdiff;h=d8434662d63c115280779941af61252663f9c134

Modified Files
--------------
doc.ja/src/sgml/connection-pooling.sgml            | 91 ++++++++++++++++++++--
doc/src/sgml/connection-pooling.sgml               | 87 ++++++++++++++++++++-
src/include/pool.h                                 | 14 +++-
src/main/health_check.c                            |  3 +
src/main/pgpool_main.c                             | 81 +++++++++++++++++++
src/protocol/child.c                               |  5 +-
src/protocol/pool_process_query.c                  | 16 ++++
.../tests/010.rewrite_timestamp/timestamp/main.c   |  6 ++
src/utils/error/elog.c                             | 10 +--
src/watchdog/watchdog.c                            |  3 +-
src/watchdog/wd_escalation.c                       |  4 +-
src/watchdog/wd_heartbeat.c                        |  4 +-
src/watchdog/wd_if.c                               |  3 +-
src/watchdog/wd_lifecheck.c                        |  3 +-
src/watchdog/wd_ping.c                             |  1 +
15 files changed, 309 insertions(+), 22 deletions(-)