Prometheus

https://github.com/narethim/tools/blob/master/setup-prometheus-node-exporter-arm64.md

https://grafana.com/docs/grafana-cloud/quickstart/noagent_linuxnode/

docker run -d --restart=always --net mqtt \
    --name=prometheus \
    -p 9099:9090 \
    --add-host=host.docker.internal:host-gateway \
    -v ~/prometheus/prometheus.yml:/etc/prometheus/prometheus.yml \
    prom/prometheus

Linux Exporter

https://linuxhit.com/prometheus-node-exporter-on-raspberry-pi-how-to-install/

https://stackoverflow.com/questions/31324981/how-to-access-host-port-from-docker-container

wget https://github.com/prometheus/node_exporter/releases/download/v0.18.1/node_exporter-0.18.1.linux-arm64.tar.gz
tar -xvzf node_exporter-0.18.1.linux-arm64.tar.gz
sudo cp node_exporter-0.18.1.linux-arm64/node_exporter /usr/local/bin
sudo chmod +x /usr/local/bin/node_exporter
sudo useradd -m -s /bin/bash node_exporter
sudo mkdir /var/lib/node_exporter
sudo chown -R node_exporter:node_exporter /var/lib/node_exporter
sudo nano /etc/systemd/system/node_exporter.service

[Unit]
Description=Node Exporter

[Service]
# Provide a text file location for https://github.com/fahlke/raspberrypi_exporter data with the
# --collector.textfile.directory parameter.
ExecStart=/usr/local/bin/node_exporter --collector.textfile.directory /var/lib/node_exporter/textfile_collector

[Install]
WantedBy=multi-user.target

sudo systemctl daemon-reload 
sudo systemctl enable node_exporter.service
sudo systemctl start node_exporter.service

Prometheus configuration

- job_name: linux
  honor_timestamps: true
  scrape_interval: 60s
  scrape_timeout: 5s
  metrics_path: /metrics
  scheme: http
  follow_redirects: true
  enable_http2: true
  static_configs:
  - targets:
    - host.docker.internal:9100

Grafana Dashboard

In Grafana, click Dashboards in the left side menu (looks like four boxes) and from the menu that appears select Manage.

Click Import. Enter the ID number 10180 for the Linux dashboard, and click Load.

OR Import the following JSON. This has had a minor adjustment to make the CPU show.

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$host","tooltip":{"shared":true,"sort":0,"value_type":"individual"},"type":"graph","xaxis":{"mode":"time","show":true,"values":[]},"yaxes":[{"format":"s","logBase":1,"show":true},{"format":"short","logBase":1,"show":true}],"yaxis":{"align":false}}],"refresh":false,"schemaVersion":37,"style":"dark","tags":["linux","node-exporter","ops"],"templating":{"list":[{"current":{},"datasource":{"type":"prometheus","uid":"${DS_PROMETHEUS}"},"definition":"label_values(node_time_seconds{job=\"$job\"},instance)","hide":0,"includeAll":false,"label":"Host","multi":true,"name":"host","options":[],"query":{"query":"label_values(node_time_seconds{job=\"$job\"},instance)","refId":"Prometheus-host-Variable-Query"},"refresh":1,"regex":"","skipUrlSync":false,"sort":0,"tagValuesQuery":"","tagsQuery":"","type":"query","useTags":false},{"current":{},"datasource":{"type":"prometheus","uid":"${DS_PROMETHEUS}"},"definition":"label_values(node_boot_time_seconds,job)","hide":0,"includeAll":false,"label":"Job","multi":false,"name":"job","options":[],"query":{"query":"label_values(node_boot_time_seconds,job)","refId":"Prometheus-job-Variable-Query"},"refresh":1,"regex":"/(.*)/","skipUrlSync":false,"sort":0,"tagValuesQuery":"","tagsQuery":"","type":"query","useTags":false}]},"time":{"from":"now-1h","to":"now"},"timepicker":{"refresh_intervals":["5s","10s","30s","1m","5m","15m","30m","1h","2h","1d"],"time_options":["5m","15m","1h","6h","12h","24h","2d","7d","30d"]},"timezone":"","title":"Linux Hosts Metrics | Base","uid":"ov0oEgdik","version":2,"weekStart":""}

Node-RED

[{"id":"d1f3d002.63ee48","type":"subflow","name":"rbe 5m","info":"","category":"","in":[{"x":60,"y":120,"wires":[{"id":"dd19c0de.9bebd"}]}],"out":[{"x":420,"y":160,"wires":[{"id":"29eae4ad.d68f2c","port":0}]}],"env":[],"meta":{},"color":"#DDAA99"},{"id":"dd19c0de.9bebd","type":"rbe","z":"d1f3d002.63ee48","name":"","func":"rbe","gap":"","start":"","inout":"out","property":"payload","x":190,"y":120,"wires":[["29eae4ad.d68f2c"]]},{"id":"8b22fc2a.83d07","type":"inject","z":"d1f3d002.63ee48","name":"","props":[{"p":"reset","v":"1","vt":"str"}],"repeat":"300","crontab":"","once":false,"onceDelay":0.1,"topic":"","x":200,"y":80,"wires":[["dd19c0de.9bebd"]]},{"id":"29eae4ad.d68f2c","type":"switch","z":"d1f3d002.63ee48","name":"","property":"reset","propertyType":"msg","rules":[{"t":"null"}],"checkall":"true","repair":false,"outputs":1,"x":280,"y":160,"wires":[[]]},{"id":"82572bd7fa2754e2","type":"link out","z":"f6f2187d.f17ca8","name":"link out 9","mode":"link","links":["058f796bc37b7250","56f925dd66127bbb"],"x":265,"y":140,"wires":[]},{"id":"7fddbf716a47caa3","type":"mqtt in","z":"f6f2187d.f17ca8","name":"","topic":"#","qos":"0","datatype":"auto","broker":"61c70212c61507f5","nl":false,"rap":false,"inputs":0,"x":130,"y":140,"wires":[["82572bd7fa2754e2","f04495f04028c894"]]},{"id":"873f73b8bd187f78","type":"subflow:d1f3d002.63ee48","z":"f6f2187d.f17ca8","name":"","x":360,"y":260,"wires":[["5b24a3ea71452cd8","a2a978223a03ad4b","f656e5b024503c03"]]},{"id":"058f796bc37b7250","type":"link in","z":"f6f2187d.f17ca8","name":"link in 1","links":["190658415505c339","82572bd7fa2754e2"],"x":215,"y":260,"wires":[["873f73b8bd187f78"]]},{"id":"f04495f04028c894","type":"debug","z":"f6f2187d.f17ca8","name":"debug 8","active":false,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","statusVal":"","statusType":"auto","x":290,"y":80,"wires":[]},{"id":"f656e5b024503c03","type":"function","z":"f6f2187d.f17ca8","name":"Metrics List","func":"\n\n\nvar metrics = {};\n\nmetrics.timestamp = new Date().getTime();\nmetrics.topic = msg.topic;\nmetrics.payload = msg.payload;\n\nvar mname = msg.topic.replace(/\\//g,\"_\")\n\n\nflow.set(\"metrics.\" + mname, metrics);\n\n\nreturn msg;","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":410,"y":340,"wires":[[]]},{"id":"1fdeb63853f6378a","type":"http in","z":"f6f2187d.f17ca8","name":"","url":"/metrics","method":"get","upload":false,"swaggerDoc":"","x":190,"y":580,"wires":[["0df212d8de0af553"]]},{"id":"78bcb731b3070bde","type":"http in","z":"f6f2187d.f17ca8","name":"","url":"/metrics/:vargroup","method":"get","upload":false,"swaggerDoc":"","x":220,"y":660,"wires":[["a9bfbf0b470f5412"]]},{"id":"a9bfbf0b470f5412","type":"function","z":"f6f2187d.f17ca8","name":"Metrics","func":"\nvar metrics = flow.get(\"metrics\")||{};\n\n\nvar net = global.get(\"config.networkId\") || \"local\";\n\nvar oot = \"\";\n//oot = 'stat_state {network=\"local\", node=\"mynodered1\", device=\"prometheus\", vargroup=\"stat\", varkey=\"state\"} 1\\n';\n\nfor (var m in metrics) {\n\n    var tops = metrics[m].topic.split(\"/\");\n    \n    if (isNaN(metrics[m].payload)) { continue; }\n    if (tops[3] != msg.req.params.vargroup) { continue; }    \n\n    \n    oot += tops[3] + '_' + tops[4] + '{network=\"' + net + '\",node=\"' + tops[1] + '\",device=\"' + tops[2] + '\",vargroup=\"' + tops[3] + '\",varkey=\"' + tops[4] + '\"} ' + metrics[m].payload + \"\\n\";\n\n}\n\n\nmsg.payload = oot;\n\nreturn msg;\n\n","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":520,"y":660,"wires":[["2bf9db2387e3c2c3","011f1ef5757fc34b"]]},{"id":"0df212d8de0af553","type":"function","z":"f6f2187d.f17ca8","name":"Metrics","func":"\n//temperature{ node = \"mynode\", topic = \"zigbee2mqtt_0x00157d00032b1234\" } { { payload } }\n\nvar metrics = flow.get(\"metrics\")||{};\n//flow.set(\"metrics\",{});\n\nvar net = global.get(\"config.networkId\") || \"local\";\n\nvar oot = \"\";\n//oot = 'stat_state {network=\"local\", node=\"mynodered1\", device=\"prometheus\", vargroup=\"stat\", varkey=\"state\"} 1\\n';\n\nfor (var m in metrics) {\n\n    if (isNaN(metrics[m].payload)) { continue; }\n    \n    var tops = metrics[m].topic.split(\"/\");\n\n    //if (tops[3] != \"dat\") { continue; }    \n\n    oot += tops[3] + '_' + tops[4] + '{network=\"' + net + '\",node=\"' + tops[1] + '\",device=\"' + tops[2] + '\",vargroup=\"' + tops[3] + '\",varkey=\"' + tops[4] + '\"} ' + metrics[m].payload + \"\\n\";\n\n}\n\n\nmsg.payload = oot;\n\nreturn msg;\n\n","outputs":1,"noerr":0,"initialize":"","finalize":"","libs":[],"x":520,"y":580,"wires":[["2bf9db2387e3c2c3","011f1ef5757fc34b"]]},{"id":"011f1ef5757fc34b","type":"debug","z":"f6f2187d.f17ca8","name":"debug 16","active":false,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","statusVal":"","statusType":"auto","x":740,"y":580,"wires":[]},{"id":"2bf9db2387e3c2c3","type":"http response","z":"f6f2187d.f17ca8","name":"","statusCode":"","headers":{},"x":730,"y":620,"wires":[]},{"id":"61c70212c61507f5","type":"mqtt-broker","name":"","broker":"mqtt","port":"1883","clientid":"","autoConnect":true,"usetls":false,"protocolVersion":"4","keepalive":"60","cleansession":true,"birthTopic":"","birthQos":"0","birthPayload":"","birthMsg":{},"closeTopic":"","closeQos":"0","closePayload":"","closeMsg":{},"willTopic":"","willQos":"0","willPayload":"","willMsg":{},"userProps":"","sessionExpiry":""}]

Prometheus Config

- job_name: dat
  honor_timestamps: true
  scrape_interval: 5s
  scrape_timeout: 5s
  metrics_path: /metrics/dat
  scheme: http
  follow_redirects: true
  enable_http2: true
  static_configs:
  - targets:
    - mynodered1:1880
- job_name: stat
  honor_timestamps: true
  scrape_interval: 60s
  scrape_timeout: 5s
  metrics_path: /metrics/stat
  scheme: http
  follow_redirects: true
  enable_http2: true
  static_configs:
  - targets:
    - mynodered1:1880

As an alternative to Linux, node-red-contrib-heatweb provides CPU related information

- job_name: cpu
  honor_timestamps: true
  scrape_interval: 60s
  scrape_timeout: 5s
  metrics_path: /metrics/cpu
  scheme: http
  follow_redirects: true
  enable_http2: true
  static_configs:
  - targets:
    - mynodered1:1880