Add a simple Prometheus exporter.

mos.yml

@@ -43,6 +43,7 @@ config_schema:
   - ["app.config", "s", {title: "Application specific config file"}]
   - ["app.config", "sonoff-basic.json"]
   - ["app.dht_gpio", "s", "5,4,14", {title: "Comma Separated list of GPIO pins to enable DHT22/AM2302 sensors on"}]
+  - ["prometheus.pushgateway", "chbtl01.paphosting.net:9091"]
 
 
 #build_vars:
@@ -58,6 +59,7 @@ libs:
   - origin: https://github.com/mongoose-os-libs/rpc-mqtt
   - origin: https://github.com/mongoose-os-libs/mqtt
   - origin: https://github.com/mongoose-os-libs/dht
+  - origin: https://github.com/mongoose-os-libs/prometheus-metrics
   - origin: libs/rpc-service-ota
 
 # Used by the mos tool to catch mos binaries incompatible with this file format