1. A computer-implemented method comprising: receiving, by a server computer, through a communication network and from a requestor client application, a client request including: (i) a request for the server computer to perform a computer operation, and (ii) a debug token; responsive to the client request, starting to perform, by the server computer, the computer operation on a sub-set of thread(s) running on a set of processor(s), where the set of processor(s) are running a set of thread(s) that: (i) includes all threads of the sub-set of threads, and (ii) includes at least one thread that is not in the sub-set of thread(s); and entering, by the set of processor(s), a thread-specific debug state so that: (i) debug information is logged with respect to the sub-set of thread(s), and (ii) debug information is not logged with respect to any thread(s) included in the set of thread(s) but not included in the sub-set of thread(s).