where does ceilometer stores all the data related to instances
suppose I have an instance (with 2 GB volume space allocated). Out of 2 GB, lets say 500 MB is used by the instance user. Now used space is 500MB and available space is 1.5 GB. So where this information is getting stored in database. Is it in mysql database or any other database(mongodb). if it is other database then, as a admin of cloud service provider, how can I access that through command line.