NETLOGON: What is I_NetLogonGetAuthData – Server Fault

We just started running NETLOGON logs as we believe that there is an issue with the DC connection and we are seeing a lot of the following in the netlogon.log:

(SESSION) (1244) I_NetLogonGetAuthData called: (null) DOMAIN (Flags 0x1) 

The number 1244 I assume is the PID making the call and not some eventID. Is this just really verbose and not really an error/issue? There is no error code after this, just the same information with a different PID.

We have looked for I_NetLogonGetAuthData and have not been able to find anything that would describe what this record is or what it represents.

Thank you.