To see the state of the variables and properties at a specific point in the test, you add a Debug sampler. This sampler dumps the information as response data into whatever result listener are configured.

If need the information in your own code to make decisions then you can use the following snippet of JSR223 code in a sampler or post processing rule:

import java.util.Map;
for (Map.Entry entry : vars.entrySet().sort{ a,b ->  a.key <=> b.key }) {
	log.info entry.getKey() + "  :  " + entry.getValue().toString();
}
for (Map.Entry entry : props.entrySet().sort{ a,b ->  a.key <=> b.key }) {
	log.info entry.getKey() + "  :  " + entry.getValue().toString();
}