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 a META.json to the distribution. Your buildtool should be able to autogenerate it.

Add =head1 LICENSE and/or the proper text of the well-known license to the main module in your code.

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: AWS::S3, AWS::S3::Bucket, AWS::S3::File, AWS::S3::HTTPRequest, AWS::S3::Owner, AWS::S3::Request, AWS::S3::Request::CreateBucket, AWS::S3::Request::DeleteBucket, AWS::S3::Request::DeleteFile, AWS::S3::Request::DeleteMulti, AWS::S3::Request::GetBucketAccessControl, AWS::S3::Request::GetBucketLocationConstraint, AWS::S3::Request::GetBucketPolicy, AWS::S3::Request::GetFileContents, AWS::S3::Request::GetFileInfo, AWS::S3::Request::ListAllMyBuckets, AWS::S3::Request::ListBucket, AWS::S3::Request::SetBucketAccessControl, AWS::S3::Request::SetBucketPolicy, AWS::S3::Request::SetFileContents, AWS::S3::ResponseParser, AWS::S3::Signer

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.

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