Count number of times value is less than immediate previous value over last two weeks
We have an SNMP uptime value we monitor, showing uptime in seconds. I'd like to be able to monitor how many times that value has reset over the last two weeks. I'm thinking something like counting how many times over the last 1209600 seconds, value X is less than value X-1. I'm not sure how to implement this, however. I'd love to be able to have this as a monitoring item so we can build easy triggers around it, but if it requires trigger logic to calculate in the first place, that would work too.