Hello,
we´re running a 6.3 Cluster and I think (since the upgrade) there seems to be a visual bug in the Single Metric Viewer. If you change time span the graphic sometimes shows the anomalies and sometimes not, e.G.:
After slightly changing time span:
Do we have a setup issue here, or could it be a bug? 
Hi Manuel,
Thanks for the report! This is a known issue with 6.3 and it has been fixed for 6.3.1, so upgrading should solve it!
Best,
Walter
PS: Since 6.3 the code for Machine Learning is public on github and we also track bugs there, see for example the details about this bug: https://github.com/elastic/kibana/pull/19029
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