/usr/share/shinken/templates/graphite/check_http.graph is in shinken-module-broker-webui-graphite 1.4-2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 | ${uri}render/?width=586&height=308&fgcolor=000000&bgcolor=FFFFFF&title=HTTP%20Response%20time&vtitle=Time%20s&target=legendValue(alias(${host}.${service}.time%2C"Time")%2C"last")
${uri}render/?width=586&height=308&fgcolor=000000&bgcolor=FFFFFF&title=HTTP%20Response%20size&vtitle=Size%20B&target=legendValue(alias(${host}.${service}.size%2C"Size")%2C"last")
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