cockroachdb / cockroachdb/cockroach

rpc: undrstand why net.recv.drop doesn't report iptable dropped packets

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A-server-networking branch-master C-bug O-support P-3 T-kv
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Description

During a [recent experiment](https://github.com/cockroachlabs/support/issues/3342#issuecomment-3033932125) that intended to validate the performance of CRDB under packet loss. We saw that the metric didn't account for packets lost using iptable (even though the packet drop rate was 1%). The goal of this issue is to understand what `net.recv.drop` exactly report. And if there are cases where packet loss exists, but the metric doesn't report it.

Jira issue: CRDB-52253

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