cockroachdb / cockroachdb/cockroach

monitoring: suspect data on the Disk Write MiB/Sec chart

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A-monitoring A-observability-inf C-bug T-observability
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Description

We noticed a discrepancy between the write mib/sec reported on the db console and what shown by iostat. Screenshots are available in the related [Slack conversation](https://cockroachlabs.slack.com/archives/CHVV403F0/p1670607454783169).

It looks like we're simply summing up the values reported in the `iostat` output

Jira issue: CRDB-22333

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