telegraf is a metric collection tool by influxData. It is opensource and can push performance data of RaspiBlitz to an external influxDB server which then can be used as a datasource for the GrafanaWebUI to monitor RaspiBlitz in a Dashboard like this:

InfluxDB & Grafana should run on separate hardware - you might use an old RaspberryPi4 for that and take a look here for a nice dockerized installation of influxDB and Grafana.

Prepare your InfluxDB for RaspiBlitz

Before you can start Teelegraf on RaspiBlitz you need to prepare a InfluxDB database for RaspiBlitz and create a user with password. So on your InfluxDB/Grafana machine follow the steps:

Start the InfluxDB shell:

influx

If you havent yet create an admin user:

CREATE USER "admin" WITH PASSWORD '[ADMIN-PASSWORD]' WITH ALL PRIVILEGES;

Create database & user:

CREATE DATABASE raspiblitz;
SHOW DATABASES;
CREATE USER "raspiblitz" WITH PASSWORD '[RASPIBLITZ-PASSWORD]';
GRANT ALL ON raspiblitz TO raspiblitz;

If you havent yet create a read-only user for Grafana:

CREATE USER "grafana" WITH PASSWORD '[GRAFANA-PASSWORD]';
GRANT READ ON raspiblitz TO grafana;

To check if all is ready:

SHOW DATABASES;
SHOW USERS;

You should see a database called raspiblitz and at least three users admin, raspiblitz & grafana.

You can now exit the InfluxDB with:

exit

Make yure that the InfluxDB configuration file contains the the [http] section:

auth-enabled = true

On our Grafana/InfluxDB machine the config could be edited with:

sudo nano /etc/influxdb/influxdb.conf

Save the file (Ctrl+O, Enter) and exit (Ctrl+X).

You my need to restart the InfluxDB server:

sudo systemctl restart influxdb

Activate Telegraf on RaspiBlitz

Back on your RaspiBlitz you can switch Telegraf service on under SSH-MAINMENU > SETTINGS > Telegraf.

Enter the connection details the script asks you for.

If you want to improve the service as a programmer you find the install script here /home/admin/config.scripts/bonus.telegraf.sh

Check Incoming Data on Grafana/InfluxDB server

If install on the RaspiBlitz went thru OK you can go back to your Grafana/InfluxDB server and see if it received some basic CPU data:

influx -username admin -password '[ADMIN-PASSWORD]'
USE raspiblitz;
SHOW MEASUREMENTS;

If data is being written successfully, you should see measurements like cpu, mem, disk, etc.

SELECT * FROM cpu LIMIT 5;

This should display the first five entries from the cpu measurement. If you see that data you can close the influxDB shell with:

exit

Add Grafana Datasource

Now configure Grafana to use the InfluxDB Data Source.

Click on the Configuration (gear icon) in the left sidebar.
Click on Data Sources.
Click Add data source and select InfluxDB.

Configure the InfluxDB Data Source:

HTTP: 
  URL: http://localhost:8086
Auth: 
  Leave default unless specific settings are needed.
InfluxDB Details:
  Database: raspiblitz
  User: grafana
  Password: [GRAFANA-PASSWORD]
HTTP Method: POST (recommended)

Click the Save & Test button to verify the connection.Now

We need the datasource UID for later - to get it:

Click on Data Sources.
Click on the new created InfluxDB data source.

Find the UID:

In the URL of your browser, you should see something like this:

http://<your_vm_ip>:3000/datasources/edit/<data_source_uid>

The part after /edit/ is the UID for your data source. It will be a unique identifier like cOZgpReMk

We will need your personal datasource UID in the next step.

Create Grafana Dashboard

Open the json data for the Dashboard in a new browser tab - following this link: https://raw.githubusercontent.com/raspiblitz/raspiblitz/refs/heads/dev/home.admin/assets/telegraf/raspiblitz-grafana-dashboard.json

Copy all JSON data (to paste it later).

In your Grafana WebUI: Click on “+” → “Import”.

Now paste the JSON data from above into the field

BUT BEFORE YOU SAVE

replace ALL InfluxDB UIDs in that json with your personal one.