package metrics import "time" // Metrics is a backend-agnostic interface for emitting metrics. // Implementations can route to DataDog, log to slog, or discard (noop). type Metrics interface { Increment(key string, tags map[string]string) Counter(key string, tags map[string]string, value int64) Distribution(key string, tags map[string]string, value float64) DistributionMs(key string, tags map[string]string, value time.Duration) WithTags(tags map[string]string) Metrics }