monitoring: allow page load latency to be NaN
Created by: bobheadxi
It seems histogram_quantile can return NaN if all buckets are 0, for example on low-traffic instances.
With this change:
Orange bar is the threshold, green is the metrics correctly not going above that threshold.
Just going with this solution because I was unable to find the "right way" to get around this. Closes https://github.com/sourcegraph/sourcegraph/issues/14401 (which has more details)