Direct energy meters can monitor a single resource spreader and can convert
their processed consumption values to a continuously updated energy figure.
Only those should get the depgroup with this function who are not
planning to change it's contents
WARNING: If, for some reason, the contents of the returned array are
changed then the proper operation of FreqSyncer cannot be guaranteed
anymore.
Allows the reading of the beginning time instance of the metering session
If there were several metering sessions done by this meter, then this
function reports the time instance when a hypothetical single continuous
metering session would have started
myDepGroup is always kept in order: first all the providers are
listed, then all the consumers, when dealing with this data member
please keep in mind this expected behavior.
If there are not enough resources for the VM currently, to recover from
this state (and allow the VM to be rescheduled) just issue a destroy
command on the VM