id,node_id,number,title,user,state,locked,assignee,milestone,comments,created_at,updated_at,closed_at,author_association,active_lock_reason,draft,pull_request,body,reactions,performed_via_github_app,state_reason,repo,type
1370340170,PR_kwDOAMm_X84-zpR-,7022,Preserve all attrs with GroupBy by default.,2448579,closed,0,,,0,2022-09-12T18:26:47Z,2022-10-18T19:15:21Z,2022-09-13T15:30:29Z,MEMBER,,0,pydata/xarray/pulls/7022,"Closes #7012

When `use_flox=False`, we pass `keep_attrs=None` to `Data*.reduce`. This ends up delete Dataset and DataArray level attrs but preserves coordinate variable attrs. We now set the default to True always to match the default behaviour of `apply_ufunc` used by `flox.xarray.xarray_reduce`.

<!-- Feel free to remove check-list items aren't relevant to your change -->

- [x] Closes #7012
- [x] Tests added
- [x] User visible changes (including notable bug fixes) are documented in `whats-new.rst`","{""url"": ""https://api.github.com/repos/pydata/xarray/issues/7022/reactions"", ""total_count"": 3, ""+1"": 2, ""-1"": 0, ""laugh"": 0, ""hooray"": 0, ""confused"": 0, ""heart"": 0, ""rocket"": 1, ""eyes"": 0}",,,13221727,pull