fix(gecko): replace dead WBNB/BUSD pool with active USDT/WBNB V3 on BNB (#920)#921
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Symptom: alertmanager fires 'geckoterminal head_lag stale on bnb' every few hours across all 3 regions in both staging and prod (observed 2026-07-06). Root cause: the BNB pool configured across 3 harnesses uses PoolID '24' which points to WBNB/BUSD PancakeSwap V2 — near-idle since Binance stopped issuing BUSD in 2024. Staging-sgp logs show 2 gecko/bnb samples per 5000 log lines vs 7 for base and 1 for solana; the sub-5min sample cadence the head_lag rule expects is impossible on a dead pool. Fix: replace with PancakeSwap V3 USDT/WBNB 0.01% fee tier, currently the #1 BSC pool by volume ($130M+ 24h). Internal GT pool_id = 160787671 (derived from app.geckoterminal.com/api/p1/bsc/pools/0x172fcd41e0913e95784454622d1c3724f546f849). Applied to all 3 harnesses that hardcode the same list: - aggregator-head-lag (fires the alert) - aggregator-latency-benchmark - metadata-coverage Co-authored-by: Florent Tapponnier <contact@mobula.io>
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Cherry-pick of #920. Stops the 'geckoterminal head_lag stale on bnb' alert firing in prod every few hours.