Noting possible issue w/ ssh-slaves 0.23.

war/pom.xml

@@ -265,6 +265,7 @@ THE SOFTWARE.
                 <artifactItem>
                   <groupId>org.jenkins-ci.plugins</groupId>
                   <artifactId>ssh-slaves</artifactId>
+                  <!-- when upgrading may need to add credentials and ssh-credentials too: https://github.com/jenkinsci/ssh-slaves-plugin/commit/7f7031bdaae528baf8e4a1cf29a95849ef268c5c -->
                   <version>0.22</version>
                   <type>hpi</type>
                 </artifactItem>