Consider this example:

See  \cite{bookentry}

with bibtextest.bib:

      title         = "{Title}",
      series        = "Technical Design Report",
      year          = "1997",

The entry bookentry is missing a required field author (p. 8 in http://mirrors.ctan.org/macros/latex/contrib/biblatex/doc/biblatex.pdf).

How can I force Biber to issue a warning along the lines of

Warning--empty author in bookentry

You can ask Biber to validate your .bib file with the option --validate-datamodel/-V.

If one runs Biber with

biber -V <filename>

for the example in the question one obtains

INFO - This is Biber 2.13
INFO - Logfile is 'warningsforbiber.blg'
INFO - Reading 'warningsforbiber.bcf'
INFO - Found 1 citekeys in bib section 0
INFO - Processing section 0
INFO - Globbing data source 'warningsforbiber.bib'
INFO - Globbed data source 'warningsforbiber.bib' to warningsforbiber.bib
INFO - Looking for bibtex format file 'warningsforbiber.bib' for section 0
INFO - LaTeX decoding ...
INFO - Found BibTeX data source 'warningsforbiber.bib'
INFO - Datamodel validation starting
WARN - Datamodel: Entry 'bookentry' (warningsforbiber.bib): Missing mandatory field 'author'
INFO - Datamodel validation complete
INFO - Overriding locale 'en-US' defaults 'normalization = NFD' with 'normalization = prenormalized'
INFO - Overriding locale 'en-US' defaults 'variable = shifted' with 'variable = non-ignorable'
INFO - Sorting list 'nty/global//global/global' of type 'entry' with template 'nty' and locale 'en-US'
INFO - No sort tailoring available for locale 'en-US'
INFO - Writing 'warningsforbiber.bbl' with encoding 'UTF-8'
INFO - Output to warningsforbiber.bbl

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