We discovered this as well in 2016. There was a problem with the time being incorrect. We opened a case and support said using the MX as an NTP server was not supported. We didn't want to use the NTP, it was just something we noticed.
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Splunk is fantastic for logging in general and now also has an API integration into Meraki that is quite useful, but Splunk is also expensive so its certainly not for everyone.
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