Log Message:
-----------
Add documentation of the fact that dtrace probes evaluate their parameters
even when not active. Explain how to prevent that with an ENABLED() check.
Modified Files:
--------------
pgsql/doc/src/sgml:
monitoring.sgml (r1.65 -> r1.66)
(http://anoncvs.postgresql.org/cvsweb.cgi/pgsql/doc/src/sgml/monitoring.sgml?r1=1.65&r2=1.66)