1. A method, comprising: determining a first rate of operations directed to a first object, and a second rate of operations directed to a second object, wherein the first object has a first provisioned throughput and the second object has a second provisioned throughput, and wherein at least one operation directed to the first object comprises a use of a first resource shared by the first object and the second object; identifying, based at least in part on (a) a throughput constraint of the first resource, (b) the respective rates of operations directed to the first and second objects, and (c) the respective provisioned throughputs, a first throughput limit for the first object, and a second throughput limit for the second object; and determining, based at least in part on the first throughput limit, whether a request for an operation directed to the first object is to be accepted.