Two main graphs with visible regression:
skx: https://s3-docs.fd.io/csit/master/trending/trending/l2-2n-skx-xxv710.html#id1
dnv: https://s3-docs.fd.io/csit/master/trending/trending/l2-2n-dnv-x553.html#t1c

Based on the date, this may probably be the same as CSIT-1815, but there is one skx sample occuring a week earlier.
Investigation is needed.