Question #253141 on Graphite changed:
https://answers.launchpad.net/graphite/+question/253141
Status: Open => Answered
Jason Dixon proposed the following answer:
The relational database is used to store user accounts and
configuration/metadata for graphs and dashboards. It also stores events
because Whisper is only desiged to store flat time-series data.
With regards to your second question, Graphite expects a datapoint for
every timestamp in each retention level. That is to say, if you don't
send a datapoint for every 5min interval at your highest granularity,
the it may rollup into "None" at the next lower retention level. My blog
post at http://obfuscurity.com/2012/04/Unhelpful-Graphite-Tip-9 may
explain this a little better.
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