Why should you use an NTP server on FortiAnalyzer and all registered devices that log into FortiAnalyzer?

View the exhibit.
What does the data point at 14:35 tell you?
In the FortiAnalyzer FortiView, source and destination IP addresses from FortiGate devices are not resolving to a hostname.
How can you resolve the source and destination IP addresses, without introducing any additional performance impact to FortiAnalyzer?
What is the main purpose of using an NTP server on FortiAnalyzer and all of its registered devices?
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