New metrics and ubus files.

src/metrics.h

@@ -0,0 +1,27 @@
+// If you modify this list, please keep the labels in metrics.c in sync.
+enum {
+    METRIC_DNS_CACHE_INSERTED,
+    METRIC_DNS_CACHE_LIVE_FREED,
+    METRIC_DNS_QUERIES_FORWARDED,
+    METRIC_DNS_AUTH_ANSWERED,
+    METRIC_DNS_LOCAL_ANSWERED,
+    METRIC_BOOTP,
+    METRIC_PXE,
+    METRIC_DHCPACK,
+    METRIC_DHCPDECLINE,
+    METRIC_DHCPDISCOVER,
+    METRIC_DHCPINFORM,
+    METRIC_DHCPNAK,
+    METRIC_DHCPOFFER,
+    METRIC_DHCPRELEASE,
+    METRIC_DHCPREQUEST,
+    METRIC_NOANSWER,
+    METRIC_LEASES_ALLOCATED_4,
+    METRIC_LEASES_PRUNED_4,
+    METRIC_LEASES_ALLOCATED_6,
+    METRIC_LEASES_PRUNED_6,
+
+    __METRIC_MAX,
+};
+
+const char* get_metric_name(int);