[v23.3.x] archival: avoid division by 0 when computing slow down rate #16073
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This leads to `-nan` being reported to seastar metrics engine and prometheus. However, prometheus text metric collector bails out leading to missing metrics. Fixes redpanda-data#16054 (cherry picked from commit 1752c42)
piyushredpanda
approved these changes
Jan 11, 2024
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Backport of PR #16071
Fixes: #16072,