A set of entry blocks is allocated. An entry block is configured with a set of monitoring attributes to store monitoring data corresponding to a monitoring request. The entry block is updated with an identifier supplied in the monitoring request. The entry block is used to store the monitoring data responsive to the monitoring request. The monitoring data comprises a continuous record of data changes at a requested location in memory from a beginning to an end a of an event corresponding to the monitoring request. A size of the monitoring data is distinct from another size of another monitoring data stored in another entry block in the set of entry blocks responsive to another monitoring request. An operation specified in the monitoring request is performed on a part of the monitoring data accessible from a monitoring attribute in the set of monitoring attributes of the entry block.