To convert counters (and any other non-gauge metrics) from Prometheus to CloudWatch, we need to report the *delta* since the last report #53
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/metrics reports the cumulative value of a counter (i.e. since the process began), but CloudWatch expects the events it receives to be the delta since the prior report. So we need to perform the subtraction ourselves, which in turn means that we need to keep track of the prior value for each such metric.