When using xarray.concat, attributes are retained, but encoding information is not. I believe encoding information should be retained, at least optionally.
In [64]: da = xarray.DataArray([1, 2, 3, 2, 1])
In [65]: da.attrs.update(foo="bar")
In [66]: da.encoding.update(complevel=5)
In [67]: da2 = xarray.concat((da, da), dim="new")
In [68]: print(da2.attrs)
OrderedDict([('foo', 'bar')])
In [69]: print(da2.encoding)
{}
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