Abstract: Logs representative of interactions by users or services with interfaces, such as clickstream logs, are generated by combining logs associated with cached data with logs associated with data generated in response to a request. When a first response to a request is generated and a portion of the response data is cached, a first log representative of interactions with the cached data is stored in association with a log identifier. When a second request is received at a subsequent time and the cached data is used to generate a second response, a second log representative of interactions with the response data will include the log identifier for the first log. In response to the log identifier, the first log is accessed and combined with the second log to form a third log representative of interactions with both the cached data and response data for the second response.