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Sometimes, your time is out of sync, and it isn't automatically fixing itself. This can happen if your time is simply too far away from what it should be, as most systems refuse to do sudden and abrupt jerks.

This can be resolved by using another chrony command:

$ sudo chronyc makestep
200 OK

Be wary, though—this command can have unexpected side effects. Sometimes, programs detect sudden jerks, and will forcibly kill themselves to avoid issues.

If you want to tell how busy your server is, you can also use serverstats on the command line:

$ sudo chronyc serverstats
NTP packets received       : 8
NTP packets dropped        : 0
Command packets received   : 1
Command packets dropped    : 0
Client log records dropped : 0