I get monitoring alerts when they restart, and I only remember getting two of those over two years
I don't have logs anymore, since I upgraded my cluster to Nautilus which can't run on HC2s (because they are 32-bits and I can't roll back my cluster to Luminous). However I have one running on a N2 and a 6TB disk with the same memory target (1.5GB), and it didn't crash since the last reboot three weeks ago, and it's currently using 1.3GB.
I don't have logs anymore, since I upgraded my cluster to Nautilus which can't run on HC2s (because they are 32-bits and I can't roll back my cluster to Luminous). However I have one running on a N2 and a 6TB disk with the same memory target (1.5GB), and it didn't crash since the last reboot three weeks ago, and it's currently using 1.3GB.