In
addition to filtering log events based on thresholds that are assigned
to loggers or appender definitions, the logging facility enables you
to use filter classes to filter log events based on the following:
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a character string in the message
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-
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a combination of strings and thresholds
Here is
a list of the filter classes:
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filters repeated log
messages
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filters messages based
on a character string in the message.
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filters messages based
on a range of thresholds.
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filters messages based
on a single threshold.
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filters messages based
on the results of a list of other filters.
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denies log events that
did not meet the criteria of previous filters in a filter policy.
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You can define one or
more filters within the <appender> definition in the logging
configuration file. Filters are not available in the logging facility
language elements for SAS programs.
Filters
are processed in the order in which they appear in the <appender>
definition, creating a filtering policy
for the appender. The filters either accept the filtering criteria
and process the log event, deny the filtering criteria and deny the
log event, or accept the filtering criteria, and the filtering process
checks the next filter in the filtering policy. If the log event has
not been denied, and if there are no other filters in the filtering
policy, the appender accepts and processes the log event.