This now lives at
core-service=platform-mbean/type=runtime:start-time

for standalone

for host=*

for host=*/server=*/

master 64d1d7f

Note the failure in integration tests comes from the fact that 
the startTime lives on the runtime part of a managed server at

/host=master/server=X -- this is not present for servers that are not started
while they can still be defined at
/host=master/server-config=X

Currently we are returning nothing here, as there is no start time.

Ian what do you propose we do with the startTime for non-started servers?

// (pseudo-code)
if (metricName.equals("startTime")) {
   if (pingServer()) {
       return getAttribute("startTime");
   } else {
       return null;
   }
}

Closing this, as returning a null value for the 'startTime' trait for a non-started Managed Server is the expected behavior.