[stable2509] Backport #9319 #9900
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…metrics accuracy (#9319) # Description The polkadot_parachain_collation_expired metric is an indicator for parachain block confidence. However, this metric has a critical issue: not every drop should be counted. Lookahead collators intentionally build collations on a relay chain block and its forks, so the drop of fork-based collations is an expected behaviour. If we count them, the drop metrics show a picture that is worse than in reality. To improve tracking accuracy, we should exclude legit drops The minor issue is also present in the expiry mechanism. It doesn't take into account that collation was moved to a different stage, e.g., from "fetched" to "backed", and can write a drop of fetched collation. To solve this issue we should: - Track relay parent finalization. - Record expiration metrics only when relay parent was finalized. - Exclude drops of fork-based collation from the metrics. - Send metrics only for collations that either finalized or dropped. --------- Co-authored-by: cmd[bot] <41898282+github-actions[bot]@users.noreply.github.com> (cherry picked from commit d51c532)
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Backport #9319 into
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