Collect metrics from HBees

[rdettai]

Currently, metrics in HBees are logged locally. They can be collected by parsing the logs. It would be easier if the key metrics were sent back to the HComb then to the Fuse, but it must be down carefully as it might increase the load on the HComb when their are many HBees, hence the measurement would influence the experiment (even though this isn't quantum mechanics 😃).