You can configure a site to log details about each request to the API services. Configuring this option can provide important information on usage and performance.
To enable metering on the site, edit the server tracing configuration for the site using Server Manager by setting the Metering tracing switch to Information. When configured, the details of any requests made to the OData API appears in the SPFServerMetering.log file found in the Tracelogs folder.
The details of each request found in the log file contains a request URL, user name,
request size, request duration and response size.