To enable Gnocchi in devstack, add the following to local.conf:
enable_plugin gnocchi https://github.com/openstack/gnocchi master
enable_service gnocchi-api,gnocchi-metricd
To enable Grafana support in devstack, you can also enable gnocchi-grafana:
enable_service gnocchi-grafana
Then, you can start devstack:
./stack.sh