maven publication step for release 10.16.1.1

[Rick Hillegas]

I am stuck at the step for using maven to publish 10.16.1.1 artifacts. 
The details of the issue can be found at 
https://issues.apache.org/jira/browse/INFRA-23348

In a nutshell, I have uploaded artifacts and checksums but not gpg 
signatures. I do not know how to generate/upload these signatures via 
maven. The error messages are opaque.

Are the gpg signatures essential or are the checksums good enough?

Thanks,

-Rick