Thanks for the feedback, dmr195.
Indeed, the truncation message you see in 6.3. is a bug. We already have an open ticket for this.
In our tests the charting.data.count setting works correctly in 6.3.0 both with 0 and 50000 as values. To reiterate, you'll still see the truncation message until we've fixed this. Could you double check that your data is truncated when raising the limit?
Long term, I agree, truncation is not optimal, and an even sampling would be more helpful.
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