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How to fetch ceilometer historical data

Hi,

I have a question related to time_to_live option available in ceilometer.conf file.by default its value is 0 which means forever.... resulting DB to grow and some point of time DB will get overflowed. before setting the value of time_to_live = 604800 in ceilometer.conf my REST API call to meter instance was returning me all the samples starting from the event compute.instance.<activity>.start but now after the change time_to_live = 604800 I can not see the older samples with event compute.instance.<activity>.start....then how would I know when did this particular instance got created ?

do we have any solution to fix this ?