grafana: add traffic metrics for staleread traffic (#43324) #44209
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Signed-off-by: ti-chi-bot <ti-community-prow-bot@tidb.io>
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Signed-off-by: you06 <you1474600@gmail.com>
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This is an automated cherry-pick of #43324
What problem does this PR solve?
Issue Number: close #43325 #43481
Problem Summary:
What is changed and how it works?
With tikv/client-go#776, we can display the following metrics:
Before 15:15, the stale-read hit ratio is high, and after 15:15, there are over 80% stale-read misses. From the metrics, we can clearly find the traffic used by stale-read.
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