If you are using Build.PL define the {requires}{perl} = VERSION field. If you are using MakeMaker (Makefile.PL) you should upgrade ExtUtils::MakeMaker to 6.48 and use MIN_PERL_VERSION parameter. Perl::MinimumVersion can help you determine which version of Perl your module needs.

Add 'use warnings' (or its equivalents) to all modules, or convince us that your favorite module is well-known enough and people can easily see the modules warn when something bad happens.

Error: DiaColloDB, DiaColloDB::Client, DiaColloDB::Client::file, DiaColloDB::Client::http, DiaColloDB::Client::list, DiaColloDB::Corpus, DiaColloDB::Document, DiaColloDB::Document::DDCTabs, DiaColloDB::Document::JSON, DiaColloDB::Document::TCF, DiaColloDB::Document::TEI, DiaColloDB::EnumFile, DiaColloDB::EnumFile::FixedLen, DiaColloDB::EnumFile::FixedMap, DiaColloDB::EnumFile::MMap, DiaColloDB::EnumFile::Tied, DiaColloDB::Logger, DiaColloDB::MultiMapFile, DiaColloDB::PDL::MM, DiaColloDB::PackedFile, DiaColloDB::Persistent, DiaColloDB::Profile, DiaColloDB::Profile::Diff, DiaColloDB::Profile::Multi, DiaColloDB::Profile::MultiDiff, DiaColloDB::Relation, DiaColloDB::Relation::Cofreqs, DiaColloDB::Relation::DDC, DiaColloDB::Relation::TDF, DiaColloDB::Relation::TDF::Query, DiaColloDB::Relation::Unigrams, DiaColloDB::Temp, DiaColloDB::Temp::Array, DiaColloDB::Temp::Hash, DiaColloDB::Temp::Vec, DiaColloDB::Timer, DiaColloDB::Utils

Add all modules contained in this distribution to the META.yml field 'provides'. Module::Build or Dist::Zilla::Plugin::MetaProvides do this automatically for you.

Add a 'repository' resource to the META.yml via 'meta_add' accessor (for Module::Build) or META_ADD parameter (for ExtUtils::MakeMaker).

This is not a critical issue. Currently mainly informative for the CPANTS authors. It might be removed later.

Add SECURITY(.pod|md). See Software::Security::Policy.

Add SECURITY(.pod|md) and add a contact address. See Software::Security::Policy.

Add CONTRIBUTING(.pod|md). See https://docs.github.com/en/communities/setting-up-your-project-for-healthy-contributions/setting-guidelines-for-repository-contributors.