Linagora: www.linagora.com
Yes, your understanding is correct. More specific answers inline in your text.
I was also wondering whether there were real implementations of OCCI Monitoring.
There are currently two prototype implementations: one in Java, another in Ruby. The difference between the two is that the first one is as "elementary" as possible (sockets, rmi, pipes), while the other exploits advanced tools like websockets, lightweight servers and such. I have a paper describing a Ruby docker-based implementation of the whole thing, where OCCI entities are implemented as Docker containers. It should be open access here. I can send you a copy anyway.
I saw Augusto will present "Beyond Nagios - Design of a cloud monitoring system" in Rome, in April. Unfortunately, I will not be able to attend it. What level of maturity does it have?
Maybe you are at SOSE in Oxford next week? I'm going to be there, and in case we can meet.
It is difficult for me to understand the level of maturity of an idea of mine. I'd say that it is ready for a real scale experiment.
There is a journal paper with a more detailed description of the monitoring interface that is already available in its web version, and should be published around May. Probably free access until April 12, but again, if you can't download just ask me.