Various message sources, e.g. syslog messages or SNMP traps, do not carry a
service level with them. If an event console rule specified a matching
criterion including the service level value 0 (meaning "no service level
specified"), the rule didn't fire for such messages. This behavior was
confusing and inconsistent with the rule matching for notifications.
Messages not carrying a service level have an implicit service level 0 now,
so EC rules can match for this case.
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