Ceph

The plan is to base support contract pricing on capacity,
which means we need a quick, easy (and moderately trusted)
means of ascertaining the deployed capacity of each supported
system.

SUGGESTED APPROACH (not to be taken to seriously)

Phone-home systems are often complex, controversial,
and brittle ... but such systems are usually intended
for support/diagnostic purposes and require regular and
detailed reports. For billing purposes we can probably
get by with something much simpler.

Perhaps we can create a new status command/option that lists
general identification, capacity and configuration information
followed by a digital signature for that report.

Customers with relatively open systems could create a cron
job that automatically ran this command and piped the output
to "mail config-reporting@inktank.com".

Customers in secure environments could copy the output,
satisfy themselves that it contained nothing inappropriate,
and then manually paste it into a message to be mailed to us.