Difference between revisions of "Ceilometer/AlarmEvaluatorJuno"
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Revision as of 15:04, 16 May 2014
Statistics over sliding windows
Statistics where increments/decrements are possible:
- count,
- sum,
- average,
- stddev
Statistics with special implementation:
- min/max : needs O(log n) space (probably in DB), where n = window size
- percentile : classical statistics query
- cardinality : approximate algorithm, extremely efficient
