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smp-server: reduce Prometheus and expiration DB load (#1872)

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* smp server: add prometheus scan indexes

* smp server: estimate queue count in metrics

* docs: add smp server db load report

* smp server: reduce msg_queues write load

* docs: document batch-2 fixes and operator actions
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sh
2026-09-19 09:02:04 +01:00
committed by GitHub
parent c6ef2876f1
commit 7056ae22cc
5 changed files with 367 additions and 13 deletions
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src/Simplex/Messaging/Server/QueueStore/Postgres.hs
+2 -1
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@@ -159,7 +159,8 @@ instance StoreQueueClass q => QueueStoreClass q (PostgresQueueStore q) where
db
[sql|
SELECT
(SELECT COUNT(1) FROM msg_queues WHERE deleted_at IS NULL) AS queue_count,
-- estimate via reltuples to avoid a full heap scan on every scrape
(SELECT GREATEST(reltuples, 0)::bigint FROM pg_class WHERE oid = 'msg_queues'::regclass) AS queue_count,
(SELECT COUNT(1) FROM msg_queues WHERE deleted_at IS NULL AND notifier_id IS NOT NULL) AS notifier_count,
(SELECT COUNT(1) FROM services WHERE service_role = ?) AS rcv_service_count,
(SELECT COUNT(1) FROM services WHERE service_role = ?) AS ntf_service_count,