file_add_path; but there are many deprecated removed. Is there a list for all and their recommended replacement?
Since the start of 2018 we have had a (reasonably) detailed changelog for
expl3 which has entries like
### Deprecated - `\token_get_prefix_spec:N`, `\token_get_arg_spec:N`, `\token_get_replacement_spec:N` replaced by `\cs_prefix_spec:N`, `\cs_argument_spec:N`, `\cs_replacement_spec:N`, respectively
Older deprecations (as for the one you mention) will not be present, though you can always try using the macro and reading what error it raises.