[pgpool-hackers: 4603] life check log is not nice

[Tatsuo Ishii]

When wd_lifecheck_method = 'query', life checking prints SQL log
something like this if log_line_prefix uses "%a" (application name):
2025-06-02 15:28:28.501: [unknown] pid 2436126: LOG:  DB node id: 1 backend pid: 2436264 statement: SELECT 1

This is not nice. Attached is a patch to teach application name (in
the patch fixed "lifecheck_ping"). After the patch, pgpool log will
look like this:

2025-06-02 15:21:39.558: lifecheck_ping pid 2424822: LOG:  DB node id: 1 backend pid: 2424828 statement: SELECT 1

Any idea? Especially better application name.

Best regards,
--
Tatsuo Ishii
SRA OSS K.K.
English: http://www.sraoss.co.jp/index_en/
Japanese:http://www.sraoss.co.jp
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