The feature to generate checksums seems to have moved from install to deploy plugin (see MDEPLOY-231). There seems to be no parameter to control the generation and the deployment of checksums any more, neither in install plugin 3.0.0-M1 (the "createChecksum" parameter apparently doesn't exist any more), nor in deploy plugin 3.0.0-M1.
I was assuming checksums would be activated by default now (see this blog post), but I end up without any checksum neither in my local repo nor in Artifactory and I cannot see anything checksum-related in the logs (running mvn deploy).
It shouldn't be important, but maybe it is: I am using https transport, not ssh.
Here a log excerpt:
[INFO] --- maven-install-plugin:3.0.0-M1:install (default-install) @ base-module ---
[INFO] Installing C:\data\src\s-libs\base\target\base-module-0.2.5-SNAPSHOT.jar to (...)
[INFO] Installing C:\data\src\s-libs\base\pom.xml to (...)
[INFO] Installing C:\data\src\s-libs\base\target\base-module-0.2.5-SNAPSHOT-sources.jar to (...)
[INFO]
[INFO] --- maven-deploy-plugin:3.0.0-M1:deploy (default-deploy) @ base-module ---
Downloading (...)
Uploading to psys_mvn: https://psys.ex1.de/artifactory/psys_mvn/de/ex1/psys/base-module/0.2.5-SNAPSHOT/base-module-0.2.5-20200311.190843-3.jar
(...)
Uploading to psys_mvn: https://psys.ex1.de/artifactory/psys_mvn/de/ex1/psys/base-module/0.2.5-SNAPSHOT/base-module-0.2.5-20200311.190843-3.pom
(...)
Uploading to psys_mvn: https://psys.ex1.de/artifactory/psys_mvn/de/ex1/psys/base-module/0.2.5-SNAPSHOT/base-module-0.2.5-20200311.190843-3-sources.jar
(...)
Uploading to psys_mvn: https://psys.ex1.de/artifactory/psys_mvn/de/ex1/psys/base-module/0.2.5-SNAPSHOT/maven-metadata.xml
(...)
Uploading to psys_mvn: https://psys.ex1.de/artifactory/psys_mvn/de/ex1/psys/base-module/maven-metadata.xml
(...)