doc: Clarify where ereport severity levels are defined
For a reader unfamiliar with the postgres code it might take some grepping to find where elevels are defined. This adds a reference to elog.h in the text like how SQLSTATE errorcodes are referenced to errcodes.h on the same page. Author: Kuwamura Masaki <kuwamura@db.is.i.nagoya-u.ac.jp> Discussion: https://postgr.es/m/CAMyC8qqp1UDA9zothnJ9CbUYByytwpALS3LkdZ6bs1w5kZw5Xg@mail.gmail.com
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@ -105,7 +105,8 @@ less -x4
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<para>
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There are two required elements for every message: a severity level
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(ranging from <literal>DEBUG</literal> to <literal>PANIC</literal>) and a primary
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(ranging from <literal>DEBUG</literal> to <literal>PANIC</literal>, defined
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in <filename>src/include/utils/elog.h</filename>) and a primary
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message text. In addition there are optional elements, the most
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common of which is an error identifier code that follows the SQL spec's
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SQLSTATE conventions.
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