feat: adjust logging; implement pem crl endpoint; add crl entries metric; lock on UseCrl

internal/metrics/metrics.go

@@ -16,19 +16,26 @@ var (
 	}, []string{labelPath})
 
 	responseStatus = prometheus.NewCounterVec(prometheus.CounterOpts{
-		Name: "response_status",
+		Name: "http_response_status",
 		Help: "Status of HTTP response",
 	}, []string{labelPath, labelStatus})
 
 	httpDuration = prometheus.NewHistogramVec(prometheus.HistogramOpts{
 		Name:    "http_response_time_seconds",
 		Help:    "Duration of HTTP requests.",
-		Buckets: prometheus.DefBuckets,
+		Buckets: prometheus.ExponentialBuckets(0.0001, 2, 10),
 	}, []string{labelPath})
+
+	CrlEntries = prometheus.NewGauge(prometheus.GaugeOpts{
+		Namespace: "ocspcrl",
+		Name:      "crl_entries_total",
+		Help:      "Number of entries in the CRL",
+	})
 )
 
 func init() {
 	prometheus.MustRegister(totalRequests)
 	prometheus.MustRegister(responseStatus)
 	prometheus.MustRegister(httpDuration)
+	prometheus.MustRegister(CrlEntries)
 }