Please, review the following change
Issue : https://bugs.openjdk.java.net/browse/JDK-8075926
Webrev: http://cr.openjdk.java.net/~jbachorik/8075926/webrev.00
The sun.management.JMXConnectorServer.<version>.<key> perf counters are
not updated when the remote management agent is stopped.
The perf counters show stale data and mislead the users.
Since it is not possible to 'un-export' perf counters we need an
additional counter tracking the version of the related perf counters in use.
In the current implementation each start of the remote management agent
will export a new set of the related perf counters
(sun.management.JMXConnectorServer.<version>.<key>) with the <version>
part increased by one. The first remote management agent start will use
0 as its version.
The new counter 'sun.management.JMXConnectorServer.remote' will have
value of -1 if the remote management is stopped and non-negative number
corresponding to the version of the related perf counters in use.
Thanks,
-JB-
