With the migration from an old to a new back-end system that aggregates the monitoring session data, all the session data before February 1st 2020 has been migrated. 

Since the old system did not have worst data metrics as the new one does, a graph with data before February 1st 2020 will show the aggregated data without the worst data. The graph will look like this:

Learn more information on the monitoring session aggregation system, read Changes on the Session Data (March 2020).

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