Why am I missing metrics?

Graphite has a configuration variable called MAX_CREATES_PER_MINUTE, which prevents the carbon server from creating too many whisper files at once.

You can wait, every minute, you should see more metrics roll in, or you can edit the config file (/opt/graphite/conf/carbon.conf) and set MAX_CREATES_PER_MINUTE to a much higher number, like 250.