/usr/share/shinken/templates/graphite/check_ping.graph is in shinken-common 2.0.3-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | ${uri}render/?width=586&height=308&target=legendValue(alias(${host}.${service}.rta%2C%22Response%20Time%22)%2C%22last%22)&title=Response%20Time%20on%20${host}&yMin=0
${uri}render/?width=586&height=308&target=legendValue(alias(${host}.${service}.pl%2C%22Paquet%20lost%20percentage%22)%2C%22last%22)&title=Packet%20Lost%20Percentage%20on%20${host}&yMin=0&yMax=100
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