# Using Prometheus out node for multiple values

**URL:** <https://discourse.nodered.org/t/using-prometheus-out-node-for-multiple-values/60214>\
**Category:** General\
**Created:** [22 March 2022 23:33 UTC](https://discourse.nodered.org/t/using-prometheus-out-node-for-multiple-values/60214 "2022-03-22T23:33:15Z")\
**Posts on this page:** 12\
**Page:** 1

<div class="post-metadata">

**Author:** ![astrojav](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/astrojav/32/58738_2.png) [@astrojav](https://discourse.nodered.org/u/astrojav)\
**Post date:** [22 March 2022 23:33 UTC](https://discourse.nodered.org/t/using-prometheus-out-node-for-multiple-values/60214/1 "2022-03-22T23:33:15Z")

</div>

Hi folks,

I have sensor data from an ESP32 being sent to node-red through an MQTT broker.  
Out of the 38 values been sent from the ESP32, 6 of them will require to be sent to the Prometheus interface and then eventually to Grafana. I have successfully sent one value ("ambient") to Prometheus using the 'Prometheus out node' with the function node below. Is there a way to include additional values in this function, or should I create a function for each value that seems to be a tedious job?  
Below is the complete object list of values from the ESP32.

```auto
msg.payload = {
    "op": "set",
    "val": parseInt(msg.payload.ambient),
    "Labels": {
    "tag_1": "Ambient",
}
}
return msg;

```

`{"controllertype":"mySQM+","firmware":127,"uptime":"03:15:52","date":"01/01/1900","time":"00:00:00","sqm":17.25,"nelm":3.32,"lux":0.0136,"ambient":23.74,"humidity":44.2,"dewpoint":10.85,"pressure":1011.4,"slpressure":1012.24,"bme280alt":7,"skyambient":20,"skyobject":20,"skystate":1,"cloudcover":100,"raining":0,"rvout":0,"rainprevhr":0,"raincurrhr":0,"raincurrday":0,"windspd":0,"windavg":0,"windgust":0,"windchill":100,"beaufort":0,"winddir":0,"gpsdate":"01/01/1900","gpstime":"00:00:00","gpslat":"-77 00 00 S","gpslon":"166 00 00 E","gpsalt":0,"gpssat":0,"gpsfix":0,"mac":"78:E3:6D:0A:24:14","makehay":16.37}`

Thanks in advance for any help.

---

<div class="post-metadata">

**Author:** ![Colin](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/colin/32/17040_2.png) [@Colin](https://discourse.nodered.org/u/Colin)\
**Post date:** [23 March 2022 08:56 UTC](https://discourse.nodered.org/t/using-prometheus-out-node-for-multiple-values/60214/2 "2022-03-23T08:56:00Z")

</div>

Do you mean the prometheus-exporter node from node-red-contrib-prometheus-exporter? It is always a good idea to say exactly which node you have installed when asking about contrib nodes.

Assuming it is that then I don't see anything in the node's help readme that says you can do more than one at a time, however you can do it all in a single function by creating an array containing all the metrics and then sending multiple messages. Something like

```auto
const metrics = [
    {
        "op": "set",
        "val": parseInt(msg.payload.ambient),
        "Labels": {
            "tag_1": "Ambient",
        }
    },
    {
        "op": "set",
        "val": parseInt(msg.payload.another_value),
        "Labels": {
            "tag_1": "Another value",
        }
    },
]
metrics.forEach(sendIt)
return null;

function sendIt(metric) {
    node.send({payload: metric})
}

```

Obviously you need to add the correct metrics at the start.

---

<div class="post-metadata">

**Author:** ![astrojav](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/astrojav/32/58738_2.png) [@astrojav](https://discourse.nodered.org/u/astrojav)\
**Post date:** [24 March 2022 22:49 UTC](https://discourse.nodered.org/t/using-prometheus-out-node-for-multiple-values/60214/3 "2022-03-24T22:49:00Z")

</div>

Hi @Colin,

Thanks for the prompt reply.  
Indeed, I was referring to the Prometheus-exporter node.  
I have changed the function like you suggested, however, the [http://locahost:1880/metrics](http://locahost:1880/metrics) is only creating metrics for the "humidity" value and not the "ambient" value as can be seen below.

![Screenshot 2022-03-24 184442](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/9/d/9d672c74fa4519108e0b731ed13c68d7667389a9.png)

The test flow I'm using is this:

```auto
[{"id":"6036fa3e58c9f358","type":"tab","label":"Flow 1","disabled":false,"info":"","env":[]},{"id":"61f5e7e4038dc507","type":"debug","z":"6036fa3e58c9f358","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","statusVal":"","statusType":"auto","x":490,"y":400,"wires":[]},{"id":"b76631f32a265a0b","type":"comment","z":"6036fa3e58c9f358","name":"Prometeus","info":"","x":340,"y":360,"wires":[]},{"id":"0fe0d20435678b5e","type":"function","z":"6036fa3e58c9f358","name":"","func":"const metrics = [\n {\n \"op\": \"set\",\n \"val\": msg.payload.ambient,\n \"Labels\": {\n \"tag_1\": \"Ambient\",\n }\n },\n {\n \"op\": \"set\",\n \"val\": msg.payload.humidity,\n \"Labels\": {\n \"tag_1\": \"humidity\",\n }\n },\n]\nmetrics.forEach(sendIt)\nreturn null;\n\nfunction sendIt(metric) {\n node.send({payload: metric})\n}","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":300,"y":440,"wires":[["61f5e7e4038dc507","a533cfd74b95eea9"]]},{"id":"95a44c2bf4eca244","type":"inject","z":"6036fa3e58c9f358","name":"","props":[{"p":"payload"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"{\"controllertype\":\"mySQM+\",\"firmware\":127,\"uptime\":\"05:13:54\",\"date\":\"01/01/1900\",\"time\":\"00:00:00\",\"sqm\":15.1,\"nelm\":1.34,\"lux\":0.0985,\"ambient\":25.17,\"humidity\":51.3,\"dewpoint\":14.4,\"pressure\":1010.97,\"slpressure\":1011.81,\"bme280alt\":7,\"skyambient\":20,\"skyobject\":20,\"skystate\":1,\"cloudcover\":100,\"raining\":0,\"rvout\":0,\"rainprevhr\":0,\"raincurrhr\":0,\"raincurrday\":0,\"windspd\":0,\"windavg\":0,\"windgust\":0,\"windchill\":100,\"beaufort\":0,\"winddir\":0,\"gpsdate\":\"01/01/1900\",\"gpstime\":\"00:00:00\",\"gpslat\":\"-77 00 00 S\",\"gpslon\":\"166 00 00 E\",\"gpsalt\":0,\"gpssat\":0,\"gpsfix\":0,\"mac\":\"78:E3:6D:0A:24:14\",\"makehay\":15.59}","payloadType":"json","x":130,"y":440,"wires":[["0fe0d20435678b5e"]]},{"id":"a533cfd74b95eea9","type":"prometheus-exporter","z":"6036fa3e58c9f358","name":"","metric":"614f88afda896b44","x":500,"y":440,"wires":[]},{"id":"614f88afda896b44","type":"prometheus-metric-config","name":"ambient","help":"Ambient temperature","labels":"","mtype":"gauge"}]

```

---

<div class="post-metadata">

**Author:** ![Colin](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/colin/32/17040_2.png) [@Colin](https://discourse.nodered.org/u/Colin)\
**Post date:** [25 March 2022 08:02 UTC](https://discourse.nodered.org/t/using-prometheus-out-node-for-multiple-values/60214/4 "2022-03-25T08:02:19Z")

</div>

Can't look at your flow at the moment as on my phone. What do you see in a debug node showing what is going to the Prometheus node?

---

<div class="post-metadata">

**Author:** ![astrojav](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/astrojav/32/58738_2.png) [@astrojav](https://discourse.nodered.org/u/astrojav)\
**Post date:** [25 March 2022 11:46 UTC](https://discourse.nodered.org/t/using-prometheus-out-node-for-multiple-values/60214/5 "2022-03-25T11:46:14Z")

</div>

@Colin  
Here's the debug node when sending the function. The flow is also displayed.

 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/0/2/02f8e555693920391b67904a8b147bd2a02fbd01.png)

I could probably create for each metric a separate function including a Prometheus node, something like the flow below, but it seems a tedious job if there are multiple sensor readings.

![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/8/0/80cf730ab082600e5abf2d939d35f6f0a5630636.png)

---

<div class="post-metadata">

**Author:** ![astrojav](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/astrojav/32/58738_2.png) [@astrojav](https://discourse.nodered.org/u/astrojav)\
**Post date:** [27 March 2022 12:39 UTC](https://discourse.nodered.org/t/using-prometheus-out-node-for-multiple-values/60214/6 "2022-03-27T12:39:48Z")

</div>

Any other ideas on this topic? Thanks.

---

<div class="post-metadata">

**Author:** ![Colin](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/colin/32/17040_2.png) [@Colin](https://discourse.nodered.org/u/Colin)\
**Post date:** [27 March 2022 14:16 UTC](https://discourse.nodered.org/t/using-prometheus-out-node-for-multiple-values/60214/7 "2022-03-27T14:16:51Z")

</div>

Looking at the docs for the node it seems to be saying that you have to define the metric in the node before you can use it, and looking at the node setup it appears that the node can only have one metric, so perhaps you have to have a separate prometheus node for each metric. I suggest you ask on the node's github page how this should be done.

---

<div class="post-metadata">

**Author:** ![Romprod](https://avatars.discourse-cdn.com/v4/letter/r/e47774/32.png) [@Romprod](https://discourse.nodered.org/u/Romprod)\
**Post date:** [21 April 2022 17:53 UTC](https://discourse.nodered.org/t/using-prometheus-out-node-for-multiple-values/60214/8 "2022-04-21T17:53:11Z")

</div>

Did you get anywhere with this? I'm trying to do pretty much the same thing but I'm stuck with the same issue.

---

<div class="post-metadata">

**Author:** ![Romprod](https://avatars.discourse-cdn.com/v4/letter/r/e47774/32.png) [@Romprod](https://discourse.nodered.org/u/Romprod)\
**Post date:** [23 April 2022 20:35 UTC](https://discourse.nodered.org/t/using-prometheus-out-node-for-multiple-values/60214/9 "2022-04-23T20:35:39Z")

</div>

@astrojav

I'm now using this and it works great, shame it needs to be done in an additional docker container

> **[GitHub - hikhvar/mqtt2prometheus: MQTT to Prometheus gateway](https://github.com/hikhvar/mqtt2prometheus)**
>
> MQTT to Prometheus gateway. Contribute to hikhvar/mqtt2prometheus development by creating an account on GitHub.

---

<div class="post-metadata">

**Author:** ![astrojav](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/astrojav/32/58738_2.png) [@astrojav](https://discourse.nodered.org/u/astrojav)\
**Post date:** [24 April 2022 01:18 UTC](https://discourse.nodered.org/t/using-prometheus-out-node-for-multiple-values/60214/10 "2022-04-24T01:18:28Z")

</div>

Here's what I did.  
I've created a function node for each data and a metric with the Prometheus-exporter node (out node).  
The code in the function looks something like this:

```auto
msg.payload = {
  "op": "set",
  "val": msg.payload.ambient,
  "Labels": {
  "tag_1": "Ambient"
}
}
return msg;

```

Once the prometeus-exporter is creating the metrics you can view them by opening up a browser and accessing the **/metrics** endpoint of the NodeRED server. For example, for me I just type [http://192.168.0.25:1880/metrics](http://192.168.0.25:1880/metrics).

Here's a screenshot of the flow:  
 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/0/6/06049a85400cd4adacf6470ef7cbf9c5bfc49c99.png)

---

<div class="post-metadata">

**Author:** ![greengolfer](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/greengolfer/32/28276_2.png) [@greengolfer](https://discourse.nodered.org/u/greengolfer)\
**Post date:** [24 April 2022 07:09 UTC](https://discourse.nodered.org/t/using-prometheus-out-node-for-multiple-values/60214/11 "2022-04-24T07:09:15Z")

</div>

Two remarks, if I may.  
Yes, the [node-red-contrib-prometheus](https://flows.nodered.org/node/node-red-contrib-prometheus-exporter) can't have variable for the name of the metric. It means that you have to create manually one configuration per parameter (metric) you want to use.

So, reusing this example, I would do this:

 ![Screenshot 2022-04-24 at 09.06.42](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/a/3/a39a631688d85e5e51696465ea1d4a7dcc65ee82.png)

And then, to use it, instead of using the function node, you can do it with the change node and jsonata:

So, the tag represent the room used. It is interesting if you have more that one room with sensors, of course.

 ![Screenshot 2022-04-24 at 09.07.26](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/9/4/9454ca14891e9d7ad7fb4affa660f443b1c98020.png)

```auto
[
    {
        "id": "efe0964e4ba44407",
        "type": "prometheus-exporter",
        "z": "3af82246.3634ae",
        "name": "Humidity",
        "metric": "3ca20af8a00e4653",
        "x": 560,
        "y": 520,
        "wires": []
    },
    {
        "id": "06bea21d9e20448f",
        "type": "change",
        "z": "3af82246.3634ae",
        "name": "Humidity",
        "rules": [
            {
                "t": "set",
                "p": "payload",
                "pt": "msg",
                "to": "{\t \"op\":\"set\",\t \"labels\":{\"room\": payload.room},\t \"val\": payload.humidity\t}",
                "tot": "jsonata"
            }
        ],
        "action": "",
        "property": "",
        "from": "",
        "to": "",
        "reg": false,
        "x": 360,
        "y": 520,
        "wires": [
            [
                "efe0964e4ba44407"
            ]
        ]
    },
    {
        "id": "4a84eadabd05f184",
        "type": "inject",
        "z": "3af82246.3634ae",
        "name": "",
        "props": [
            {
                "p": "payload"
            },
            {
                "p": "topic",
                "vt": "str"
            }
        ],
        "repeat": "",
        "crontab": "",
        "once": false,
        "onceDelay": 0.1,
        "topic": "",
        "payload": "{\"room\":\"kitchen\",\"humidity\":55}",
        "payloadType": "json",
        "x": 150,
        "y": 520,
        "wires": [
            [
                "06bea21d9e20448f"
            ]
        ]
    },
    {
        "id": "3ca20af8a00e4653",
        "type": "prometheus-metric-config",
        "name": "sensor_humidity",
        "help": "Value of humidity",
        "labels": "room",
        "mtype": "gauge"
    }
]

```

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [23 June 2022 07:09 UTC](https://discourse.nodered.org/t/using-prometheus-out-node-for-multiple-values/60214/12 "2022-06-23T07:09:21Z")

</div>

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