Interesting.
Assume you want to track events that are supposed to run every minute of the day. You could sum them by hour (by event type) and should get about 60 events/hr per event type. Then you could represent each hour as a colored scatter point as either green (58-66), yellow (50-58), red (<50) or purple (>66).
If so, you could monitor 20 different events, setting a specific 'Y-axis' value for each different type so they appear horizontally in parallel. Using a scatter time basis that goes back to 1970 isn't very realistic. With scatter, can you specify earliest as '-24h' or 'today?
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