Node-red-contrib-prometheus-exporter

[FeliceM]

Hi there,
I am using Nodered to collect metrics from various sensors and store the output in influxDB.
I am now facing the need to expose my metrics to Prometheus. I have installed prometheus on a Raspberry Pi4 and looks like its working.
I have installed the node "node-red-contrib-prometheus-exporter" but as expected I am not really sure about how to use this node.
Is there anyone that has any experience with this node to guide me in getting it working?

Thank you

[Steve-Mcl]

The readme seems to have a decent amount of info. Have you tried the example it has written up?

[FeliceM]

I am not a coder. Just hobby.
I am using this flow to store the metrics in InfluxDB. It is working fine.

[{"id":"f20693fd.b834c","type":"inject","z":"4e4990f3.d4ada","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":true,"onceDelay":0.1,"topic":"","payloadType":"date","x":110,"y":80,"wires":[["755a63bbae97be1c","a7cb2c37.61171"]]},{"id":"a7cb2c37.61171","type":"exec","z":"4e4990f3.d4ada","command":"python -u /home/pi/Develop/ADS/adsTestAh4.py","addpay":false,"append":"","useSpawn":"true","timer":"","winHide":false,"oldrc":false,"name":"Comm Analog","x":380,"y":80,"wires":[["e113dd69.db7cf"],[],[]]},{"id":"e113dd69.db7cf","type":"function","z":"4e4990f3.d4ada","name":"","func":"var t=msg.payload;\nif(t!==\"\")\n{\nk=t.split(':');\nfor (i = 0; i < k.length; i++)\n{\n    k[i]=parseFloat(k[i]);\n}\nmsg.topic=\"Analogues\";\n\tif(k[0]&&k[1]&&k[2]&&k[3]&&k[4]&&k[5])\n\t\t{\n\t\tmsg.payload={\"AP0\":k[0],\"AP1\":k[1],\"AP2\":k[2],\"AP3\":k[3],\"Ah\":k[4],\"InstP\":k[5]};\n\t\treturn msg;\n\n    }\n}\n\n\n","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":600,"y":60,"wires":[["afcb27fb.7d26e8","e88b07f59c08c5e6"]]},{"id":"afcb27fb.7d26e8","type":"influxdb out","z":"4e4990f3.d4ada","influxdb":"b87cafc6.11924","name":"Analog-Influx","measurement":"check2","precision":"","retentionPolicy":"","database":"sensors","precisionV18FluxV20":"s","retentionPolicyV18Flux":"","org":"organisation","bucket":"bucket","x":770,"y":100,"wires":[]},{"id":"e88b07f59c08c5e6","type":"debug","z":"4e4990f3.d4ada","name":"","active":false,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","statusVal":"","statusType":"auto","x":770,"y":40,"wires":[]},{"id":"b87cafc6.11924","type":"influxdb","hostname":"127.0.0.1","port":"8086","protocol":"http","database":"datastorage","name":"","usetls":false,"tls":"","influxdbVersion":"1.x","url":"http://localhost:8086","rejectUnauthorized":true}]

I would love to see an example of how to expose the output of my function to Prometheus. Not having experience, I am not coming right with the info given on the node wiki.

[FeliceM]

I think I have fixed the issue. The Prometheus node is expecting an object, I was passing a number.
Passing an object resolved the issue.