Hello, I am doing the same thing these days. I am not sure either.

But when I look at the code I find the mapping maybe like this resource_id --> metric_id (metric table) --> directory(metric_id) --> measure_id+timestamp.

I try to check the 'metric' table in mysql. I find the 'id' field and 'resource_id' field are unread characters. I guess it caused by formatting by gnocchi.

I am also have many other questions. gnocchi-metric Is it doing the measure aggregate asynchronously. what is gnocchi-statsd doing? and how often ceilometer dispatch measures to gnocchi?

@spradeepv - Gnocchi doesn't collect data on its own. It's just a backend for storing data. To make it work with Ceilometer U have to configure gnocchi dispatcher in ceilometer.conf and set meter_dispatcher. Smth like:

meter_dispatcher=gnocchi

This will make ceilometer to collect data and send it to Gnocchi.

@Cow - regarding statsd:

A network daemon that runs on the Node.js platform and listens for statistics, like counters and timers, sent over UDP or TCP and sends aggregates to one or more pluggable backend services (e.g., Graphite).

More info at - https://github.com/etsy/statsd/