I would like to use JavaMelody to monitor multiple Java web apps (app1, app2, app3) individually. My server is Tomcat9.
Is it simply copy the files javamelody.jar and jrobin-1.5.9.jar to the WEB-INF/lib directory of the each war (app1, app2, app3) of the webapp to monitor?
Yes it is. The javamelody jar file and the jrobin-1.5.9.jar file should be copied in each WEB-INF/lib.
Doc: https://github.com/javamelody/javamelody/wiki/UserGuide#javamelody-setup