The type of the metric to which the per-service
per-metric weight applies. When this metric is
referenced with respect to this server and port, the
metric's value will be multiplied by the weight given.
For example, if one remote server is known to be able
to handle twice the load of another remote server, the
DFP availability metric's value can be multiplied by a
weight of '2' for the slower server and by a weight of
'1' for the faster server.