feat(prometheus): add bytes metrics as counter #3246
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flaneur2020
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in the previous PR I converted the metrics in PrometheusLayer as it into PrometheusClientLayer, but I missed an important metric not included in the PrometheusLayer before is the bytes total metrics.
we already have a histogram about the bytes which is useful for us to find out the distribution of the size on different IO requests. however, a bytes metric in counter is more useful for us to get the IO bandwidth infomation, which is important for us to diagnose the issues on IO.
this PR also fixed a naming issue about counters in PrometheusClientLayer, the prometheus-client tend to append a
_totalsuffix in a dump way for every counters, if we name a counter asopendal_errors_totalwhat we finally get isopendal_errors_total_total, which is bad :(