observer: block headroom SLI demo#533
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Adds observer/ with a small PAPI script that exercises three SLIs against a Bulletin RPC (Paseo today): - Block production: actual vs expected by slot cadence - Block headroom: per-block stored count and bytes below 80% of caps - Authorization lifecycle: event-derived model vs on-chain storage Demo only. No Prometheus exporter, no alerting, no Bitswap probe (follow-up). README documents how to run against Paseo and current limitations.
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Parablocks are produced at the relay-chain slot cadence under async backing, not at the AURA SlotDuration constant. The expected-block denominator in the production SLI must use 6s to match reality. Also document that the SLO window is 2 weeks.
Strip how-to-read-the-code prose from README and the file header. Keep the why (what these SLIs are, the 2-week window, scope limits) and the only how that's necessary: the three commands to run.
Drop block production and authorization tracking from the demo so this PR lands one SLI at a time. The other two SLIs (and the Bitswap Read-ability probe) get their own PRs once this one's reviewed.
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Adds a standalone
observer/directory with a small PAPI script that exercises one chain-derived SLI for Bulletin Chain: block headroom.For each finalized block on Paseo Bulletin, the script counts
transactionStorage.Storedevents and sums thesizefield ofTransactionStorage::Transactions(N), then classifies the block as good (bothcount < 0.8 × 512andbytes < 0.8 × 8 MB) or bad. Running SLI =good / (good + bad). SLO window is 2 weeks.Out of scope here, planned as follow-up PRs:
See
observer/README.mdfor run instructions and current limitations.