Cloud Functions 世代移行で発生した1000万件のメッセージ滞留：Pub/Sub × Cloud Run × Spanner のチューニング

はじめに こんにちは。Merpay の Payment & Customer Platform で会計システムを開発・運用する Accounting チームで Backend Engineer をしている @mewuto です。本記事は「 Merpay & Mercoin Tech Openness Month 2026 」の11日目の記事です。

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