Add uptime to Prometheus metrics

src/web/web.h

@@ -681,8 +681,13 @@ class Web {
                             mApp->getVersion(), mConfig->sys.deviceName);
                         metrics = String(type) + String(topic);
 
-                        snprintf(topic,sizeof(topic),"# TYPE ahoy_solar_freeheap gauge\nahoy_solar_freeheap{devicename=\"%s\"} %u\n",mConfig->sys.deviceName,ESP.getFreeHeap());
-                        metrics += String(topic);
+                        snprintf(type,sizeof(type),"# TYPE ahoy_solar_freeheap gauge\n");
+                        snprintf(topic,sizeof(topic),"ahoy_solar_freeheap{devicename=\"%s\"} %u\n",mConfig->sys.deviceName,ESP.getFreeHeap());
+                        metrics += String(type) + String(topic);
+
+                        snprintf(type,sizeof(type),"# TYPE ahoy_solar_uptime counter\n");
+                        snprintf(topic,sizeof(topic),"ahoy_solar_uptime{devicename=\"%s\"} %u\n", mApp->getUptime());
+                        metrics += String(type) + String(topic);
 
                         // NRF Statistics
                         stat = mApp->getStatistics();
@@ -789,7 +794,7 @@ class Web {
 
         String radioStatistic(String statistic, uint32_t value) {
             char type[60], topic[80], val[25];
-            snprintf(type, sizeof(type), "# TYPE ahoy_solar_radio_%s gauge",statistic.c_str());
+            snprintf(type, sizeof(type), "# TYPE ahoy_solar_radio_%s counter",statistic.c_str());
             snprintf(topic, sizeof(topic), "ahoy_solar_radio_%s",statistic.c_str());
             snprintf(val, sizeof(val), "%d", value);
             return ( String(type) + "\n" + String(topic) + " " + String(val) + "\n");