Number of changes in a deployment seems to be a vanity metric, since it doesn't really speak to how profound a change is. Deployments were just one example of a single event with no relevant quantifiable data points to plot on the timechart. Other examples could be things like restarting servers, human workflow CRM steps (email or call sent), or start/end of a promotional campaign. Each of those examples could be pit against other logs with server, application, or KPI data for a holistic report or dashboard.
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