Developer Builds Prometheus Exporter to Alert on Resend Email Bounce Failures

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A developer created resend-exporter, an open-source Prometheus exporter and webhook receiver designed to surface Resend email delivery failures as actionable monitoring signals. The tool was built after a bounced appointment confirmation email went unnoticed, highlighting how transactional email failures can quietly become support problems without operational visibility. It receives Svix-signed webhooks from Resend, verifies their signatures, and exposes Prometheus metrics that Grafana can use to trigger alerts on events like bounces, failures, and delivery delays. The exporter is intentionally lightweight, requiring no database, no queue, and no Resend API key for basic webhook operation. By converting email delivery events into metrics such as resend_email_events_total, it integrates transactional email health into existing monitoring stacks without adding a separate dashboard.

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