Data logging for the Managed device can be cleared with Admin account with versions 5.10.x and newer.

Login to Nodegrid via WebGUI as admin and click on the Managed device you need to clear the logs from the Access page. The Managed device with Data logging enabled will have two options to Show Data Log and Clear Data Log. Click on Clear Data Log to clear the logs for the selected device.

Clear logs for Managed device using Admin account via CLI

Access the Nodegrid as admin via ssh or console

Enter the commands below to clear the logs