/usr/share/doc/graphite-carbon/examples/whitelist.conf.example is in graphite-carbon 0.9.12-3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | # This file takes a single regular expression per line
# If USE_WHITELIST is set to True in carbon.conf, only metrics received which
# match one of these expressions will be persisted. If this file is empty or
# missing, all metrics will pass through.
# This file is reloaded automatically when changes are made
.*
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