windows_iis_worker_request_errors_total sometimes greater than windows_iis_worker_requests_total

[EliaMaggioniSGS]

Hello,

I am noticing an odd behavior in some of my dashboards resulting error rates (errors over total) sometimes greater than 1.
I tracked down the issue in what I think could be a bug in those 2 counters.
You can see here in this dashboard

The green line is
windows_iis_worker_request_errors_total{instance="$instance", status_code=~"500", app="App1"}
where the yellow line is
windows_iis_worker_requests_total{instance="$instance", app="App1"}

As you can clearly see, the requests_errors metric increased by 3 (151 - 148) where as the requests_total only increased by 2 (152-150) between those 2 datapoints. This means that the rate will be higher, therefore resulting in a higher-than-1 error rate.