docs: добавлены подсказки к метрикам

pkg/metrics/request.go

@@ -27,14 +27,17 @@ func NewRequestMetrics(subsystem string, durationBuckets []float64, labels ...st
 		Total: prometheus.NewCounterVec(prometheus.CounterOpts{
 			Subsystem: subsystem,
 			Name:      "service_requests_total",
+			Help:      "Количество запросов.",
 		}, []string{"method"}),
 		FailedTotal: prometheus.NewCounterVec(prometheus.CounterOpts{
 			Subsystem: subsystem,
 			Name:      "service_requests_failed_total",
+			Help:      "Количество запросов, вернувших ошибку.",
 		}, []string{"method"}),
 		DurationSeconds: prometheus.NewHistogramVec(prometheus.HistogramOpts{
 			Subsystem: subsystem,
 			Name:      "service_request_duration_seconds",
+			Help:      "Длительность обработки запроса.",
 			Buckets:   durationBuckets,
 		}, []string{"method"}),
 	}