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Why was the OSD down

Hello together

Surely this isn't a smart question but how can I  see the reason why an OSD was down?

I got two mails in one hour (11:35 and 12:41) that one OSD was down (in both cases the same OSD) but when I take a look in the Dashboard a few moments later all OSD's were up.  At around the same time one of our vCenter hosts lost the heartbeat to one of the iSCSI disks. Now I want to know where exactly the problem was.

We have version 2.7.2 and three management nodes and three storage nodes with 8 SSD each, one SSD per node installed this morning

Many Thanks

logs for OSDs are in /var/log/ceph