[ixpmanager] sFLOW graph limiting

[Paul Emmons]

Yesterday we had an issue with our mysql box running out of disk space . 
. . Between the new logging (ok only 170k entries) and 3.4 million 
entries in our irrdb_prefixes the binlogs just got out of control.  We 
fixed that with 3 days of logs instead of 30 days of binlogs until we 
can do a migration to a bigger box.

The downside was that our sflow rrds got hosed.   Any thoughts of being 
able to enforce an upper limit in the RRDs?

~ Paul
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