Which syslog severity level indicates normal yet significant condition messages?

The syslog severity level that indicates normal yet significant condition messages is "notice." This level is used for events that are not just informative but also are noteworthy because they may indicate an important system condition, even if they do not signify an error or failure.

In the context of syslog, different severity levels are used to classify messages based on their importance. While "emerg" indicates a system is unusable and "debug" pertains to debugging messages that might be too verbose without indicating a significant condition, "notice" serves as an alert for standard operations that should be acknowledged but do not require immediate attention. The "error" level signals a failure that needs to be addressed, which doesn't align with the notion of a "normal yet significant" condition. Hence, "notice" appropriately encapsulates messages that are important enough to note, yet do not represent a fault.