# Functions
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NewPrometheusShadowsocksMetrics constructs a metrics object that uses `ipCountryDB` to convert IP addresses to countries, and reports all metrics to Prometheus via `registerer`.
# Structs
NoOpMetrics is a fake ShadowsocksMetrics that doesn't do anything.
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# Interfaces
ShadowsocksMetrics registers metrics for the Shadowsocks service.