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Why this exists Prometheus scrapes metrics from an HTTP endpoint. If a system you care about has no exporter, or you want application level numbers (queue depth, job success, endpoint latency), writing a small exporter…
A Prometheus Exporter in Go: Counters, Gauges, Histograms and Alert Rules
Expose your own metrics for Prometheus: an endpoint prober that publishes up and latency series, an HTTP middleware that counts requests and times them, the metric types and when to use each, label cardinality rules, and a matching alert.
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