1. A computer-implemented method including: at a first computer system: receiving a log including entries generated based on events that occurred during execution of one or more computer programs on a second computer system, the one or more computer programs including a first computer program, the events including a first event, the entries including a first entry, the first entry including first state information describing a state of execution of at least the first computer program at a time at which the first event occurred; and based on information in the log, generating a visualization of execution of at least the first computer program, the visualization including at least one graphic representing a passage of time associated with execution of at least a portion of at least the first computer program, wherein: a first portion of the entries comprise data formatted according to a native format of a logging mechanism used when generating the log, and a second portion of the entries comprise data formatted according to a specification and in a format other than the native format of the logging mechanism, the data including first and second elements of the first state information, each of the first and second elements of the first state information being tagged with respective first and second tags defined by the specification.