The tag is present in Lintian version 2.104.244. That is the most recent version we know about.
This tag is currently only issued for libcblas.so. For an explanation, please continue below.
The symbols in
libcblas.so, which represent the
were merged into
libblas.so. (Note the missing letter
The old library is still being shipped until all packages have modified
their build systems, but it is not managed by
and may result in poor performance. Please do not use it anymore.
Some packages may require functionality specific to Atlas3, which is not
implemented by other
BLAS/CBLAS alternatives. Please override the
tag if your package falls into that category.
Refer to https://wiki.debian.org/DebianScience/LinearAlgebraLibraries, https://lists.debian.org/debian-devel/2019/10/msg00273.html, and https://salsa.debian.org/science-team/lapack/-/blob/master/debian/README.if-you-look-for-libcblas.so.3 for details.