mod. remove datetime element from "dist" aggregator.  Modify aggregator kwargs to cast data to "float" to avoid json serialization errors.
mod. remove datetime element from "dist" aggregator.  Modify aggregator kwargs to cast data to "float" to avoid json serialization errors.

rfaulkner/wikipedia_user_metrics,wikimedia/analytics-user-metrics,wikimedia/user_metrics,wikimedia/user_metrics,wikimedia/user_metrics,wikimedia/analytics-user-metrics,wikimedia/analytics-user-metrics,rfaulkner/wikipedia_user_metrics,rfaulkner/wikipedia_user_metrics