Abstract: Generally described, one or more aspects of the present application relate to prefetching container images for use in a cluster of virtual machines. For example, the cluster manifest may indicate an ordered list of image repositories and a set of container images that are likely to be executed on the cluster. Based on this indication, the set of container images can be prefetched onto the caches of the virtual machines in the cluster, such that when requests to execute those container images are eventually received, the container images can be accessed from the caches rather than from a remote repository.

Abstract: An event applier service obtains state change information for a plurality of software containers from a transaction journal. Based at least in part on operations specified in the state change information for the plurality of software containers, the event applier service generates event data for the plurality of containers. The event applier service updates a database to indicate that the state change information has been processed to generate the event data. The event applier service provides the event data.

Abstract: Methods, computer systems, and computer-storage media for forming a topic graph with at least one temporal element are provided. URL-query pairs are received and a topic graph is formed comprising the URL-query pairs. At least one topic associated with a URL and an importance of each topic is identified. In embodiments, a list of top topics is identified.