$ git clone https://github.com/ceph/ceph.git
$ cd ceph
$ cat src/osd/PeeringState.h src/osd/PeeringState.cc | doc/scripts/gen_state_diagram.py > doc/dev/peering_graph.generated.dot
$ sed -i 's/7,7/1080,1080/' doc/dev/peering_graph.generated.dot
$ dot -Tsvg doc/dev/peering_graph.generated.dot > doc/dev/peering_graph.generated.svg