When client statistics logging is enabled, the ClientStats.log is created in the FileMaker Server/Logs/ folder.
To enable client statistics logging, use the CLI command fmsadmin enable clientstats. See Using the command line interface. 
Statistic  | Description  | 
Client  | For a FileMaker Pro Advanced or FileMaker Go client, the user login name is displayed. For ODBC clients, JDBC clients, and Web Publishing clients, a machine identifier with an IP address is displayed. For FileMaker WebDirect clients, a FileMaker WebDirect session identifier is displayed. For FileMaker Data API clients, the user login name and client IP address or host name is displayed.  | 
Remote Calls  | Number of remote calls completed. Note that there can be multiple remote calls to perform a single operation from the client's perspective.  | 
In Progress  | Number of remote calls that are pending completion. The start of the remote call can be during the current collection interval or the previous interval.  | 
Elapsed Time  | Elapsed time (in microseconds) of a completed remote call or an in-progress remote call.  | 
I/O Time  | Time (in microseconds) spent by the client's thread waiting for input and output to complete.  | 
Wait Time  | Time (in microseconds) spent by the client's thread waiting for other threads or resources.  | 
Net Bytes In  | Number of bytes received from the client to FileMaker Server (data requests).  | 
Net Bytes Out  | Number of bytes sent to the client from FileMaker Server (notifications).  | 
•The Client Statistics setting is automatically disabled when you stop the Database Server.
•You can view client statistics by opening the ClientStats.log file in any application that can read tab-delimited data.
•When the ClientStats.log file reaches the log file size limit, it is renamed ClientStats-old.log and a new ClientStats.log file is created.