- DBLogTestCase::testFilter in core/
modules/ dblog/ tests/ dblog.test - Tests the database log filter functionality at admin/reports/dblog.
- system_update_1057 in core/
modules/ system/ system.install - Add default for watchdog_enabled_severity_levels.
- watchdog_severity_enabled in core/
includes/ bootstrap.inc - Check if logging is enabled for a given severity level.
- watchdog_severity_levels in core/
includes/ common.inc - Returns a list of severity levels, as defined in RFC 3164.