Instead of going to your storagenode.log, go to your storagenode-updater.log. scroll through it, and see if you can find anything along the lines of: storage-node service restarting. Restart Failed. OR, service restarted successfully.
Instead of going to your storagenode.log, go to your storagenode-updater.log. scroll through it, and see if you can find anything along the lines of: storage-node service restarting. Restart Failed. OR, service restarted successfully.