1. A computer-implemented method, comprising: receiving a list of multiple events that have occurred in a distributed computing system over a specified period, the events related to a first computer node and a second computer node of the distributed computing system, the first computer node configured to manage a data access request received from a client computer node for data stored at a storage system associated with the first computer node, the second computer node configured to take over from the first computer node in case the first computer node becomes unavailable; determining, based on an event classification policy, a set of non-veto events and a set of veto events related to the second computer node from the events; retrieving, based on the event classification policy, a severity index and a compliance factor for each event of the set of non-veto events; and computing a confidence measure of the second computer node as a function of the set of veto events and the severity index and the compliance factor of the set of non-veto events.