Instrument Go services with Prometheus metrics: RED/USE methods, histograms, labels, and cardinality control.
## CONTEXT I want first-class Prometheus metrics in my Go service to monitor health and performance using the RED (Rate, Errors, Duration) and USE (Utilization, Saturation, Errors) methods. I need correct metric types, sane histogram buckets, controlled label cardinality, and a clean /metrics endpoint in 2026. ##…
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