Ignition 7.9.3 just installed on Ubuntu Azure VM, trial license.
CPU and memory usage is very minimal (close to 0), only one project set up, no tags created yet, no database activity, etc. Server CPU and memory usage is also minimal (close to 0).
About 12 hours after installation there were about 50 Clock Drift warnings over a 15 minute period.
24 hours later the same thing happened.
This flurry of Clock Drift warnings occurs periodically ever few hours now.
The actual deviation cycles between positive and negative values for subsequent warnings. For example, if the first warning is -1400, the next one will be 1400, then -1400, and so on.