Re: New GUC to sample log queries

=# select name, short_desc, extra_desc, category from pg_settings where category like 'Reporting%When%' ;
─[ RECORD 1 ]────────────────────────────────────────────────────────────────────────────────────────────────────
name       │ log_min_duration_statement
short_desc │ Sets the minimum execution time above which statements will be logged.
extra_desc │ Zero prints all queries. -1 turns this feature off.
category   │ Reporting and Logging / When to Log
─[ RECORD 2 ]────────────────────────────────────────────────────────────────────────────────────────────────────
name       │ log_min_error_statement
short_desc │ Causes all statements generating error at or above this level to be logged.
extra_desc │ Each level includes all the levels that follow it. The later the level, the fewer messages are sent.
category   │ Reporting and Logging / When to Log
─[ RECORD 3 ]────────────────────────────────────────────────────────────────────────────────────────────────────
name       │ log_min_messages
short_desc │ Sets the message levels that are logged.
extra_desc │ Each level includes all the levels that follow it. The later the level, the fewer messages are sent.
category   │ Reporting and Logging / When to Log
─[ RECORD 4 ]────────────────────────────────────────────────────────────────────────────────────────────────────
name       │ log_statement_sample_rate
short_desc │ Fraction of statements to log.
extra_desc │ 1.0 logs all statements.
category   │ Reporting and Logging / When to Log

The description here seems a bit short on details to me.  I would say
something like "Fraction of statements over log_min_duration_statement
to log"; otherwise it's not clear why this doesn't apply to
log_statement.  I think the extra_desc should be more verbose too. (Not
really clear to me what to put in each ... suggestions welcome.)

(More generally, I think we should add a lot more juice to the GUC
description fields.)

Attached is pgindent fixes for your next submission.

-- 
Álvaro Herrera                https://www.2ndQuadrant.com/
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