XrootD Monitoring Validation

XRootD detailed monitoring (also called the f-stream) data stream was audited for correctness and completeness. This stream includes all file accesses that a XRootD server performs. A single OSG monitoring collector collects and processes monitoring data from all XRootD instances in the U.S. Several bug fixes were corrected in the monitoring collector, but none of that significantly affected the collected data. Features were added to the XRootD server that reduce the losses due to using the unreliable UDP protocol between the servers and the collector.  After these features and bug fixes were applied, the monitoring stream showed no loss of transfer monitoring data and was consistent with the server and client’s behavior.