188.8.131.52.4.1.3184.108.40.206.1.27.X shows what Netscreen thinks latency (in ms) is through IPSec tunnel number X. See my old post on how to find tunnel number.
Here is another one. How much data was transferred via policy number Y.
Beware, it reports in Bytes/sec. In order to make it work, you'll have to configure policy with "count" option.