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Prometheus Postfix exporter metrics.

This dashboard parses data from the Prometheus Postfix exporter and renders it in various graphics. Data can be aggregated across all mailservers or on a subset. Supports per-daemon message processing rate, queue message counts and sizes, delivery duration, rejection rates and TLS cipher usage.

Originally written by @BartVerc by adapted to normal exporter metrics by @anarcat.

DEPRECATION NOTICE: I do not actually use this dashboard anymore as there are significant issues with the postfix exporter. Instead I use a mtail-based approach, see this page for details: https://gitlab.torproject.org/tpo/tpa/grafana-dashboards

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