I would expect the graphs to be normalized against a noise floor of how many people report the service being down "most of the time." (And looking into it, ind

I would expect the graphs to be normalized against a noise floor of how many people report the service being down "most of the time." (And looking into it, indeed they are — looks like, in the detail view of a chart, there's a long-term weighted-running-average "baseline" value on the chart's data-points. See e.g. the dotted blue line on https://downdetector.com/status/google/ https://downdetector.com/status/google/. And the summary view seems to normalize its charts by their baseline.)