This example visualizes the timing and error events from a Heroku scheduler run for the “buoys” app, which fetches ocean wave data from New South Wales government GIF graphs. A timeline chart shows the sequence of log lines, highlighting when specific location fetches (Byron Bay, Sydney, Eden) succeed or fail. The code uses D3’s `d3.forceSimulation` to position nodes representing each log entry, with colors distinguishing app messages, scheduler state changes, and the socket hang-up error. Data comes from the gist’s plain-text log file, parsed and rendered with SVG paths and D3 scales.