Release PR for v2.15.0

[vastin]

Issue #, if available:

Description of changes:

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 24.27%. Comparing base (26f9a2f) to head (a06370f).
⚠️ Report is 27 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff            @@
##             master     #392   +/-   ##
=========================================
  Coverage     24.27%   24.27%           
  Complexity      498      498           
=========================================
  Files           138      138           
  Lines          5256     5256           
  Branches        635      635           
=========================================
  Hits           1276     1276           
  Misses         3797     3797           
  Partials        183      183           

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