docs: add page on grafana/influxdb dashboard (#26179)

* add page on grafana/influxdb dashboard

* fix sort key

* fix sort-key

* + explicit links to influx/grafana downloads pages

* Update docs/_interface/dashboards.md

docs/_interface/dashboards.md

@@ -0,0 +1,191 @@
+---
+title: Grafana Dashboard
+sort_key: S
+---
+
+There are several ways to monitor the performance of a Geth node. Insights 
+into a node's performance are useful for debugging, tuning and understanding 
+what is really happening when Geth is running.
+
+## Prerequisites {#prerequisites}
+
+To follow along with the instructions on this page you will need:
+
+- a running Geth instance.
+- basic working knowlegde of bash/terminal.
+
+[This video](https://www.youtube.com/watch?v=cOBab8IJMYI) provides an excellent 
+introduction to Geth monitoring.
+
+## Monitoring stack {#monitoring-stack}
+
+An Ethereum client collects lots of data which can be read in the form of a 
+chronological database. To make monitoring easier, this data can be fed into 
+data visualisation software. On this page, a Geth client will be configured 
+to push data into a InfluxDB database and Grafana will be used to visualize 
+the data.
+
+## Setting up InfluxDB {#setting-up-influxdb}
+
+InfluxDB can be downloaded from the [Influxdata release page](https://portal.influxdata.com/downloads/). 
+It can also be installed from a [repository](https://repos.influxdata.com/). 
+
+For example the following commands will download and install InfluxDB on a 
+Debian based Linux operating system - you can check for up-to-date instructions 
+for your operating system on the InfluxDB [downloads page](https://portal.influxdata.com/downloads/):
+
+```sh
+curl -tlsv1.3 --proto =https -sL https://repos.influxdata.com/influxdb.key | sudo apt-key add
+source /etc/lsb-release
+echo "deb https://repos.influxdata.com/${DISTRIB_ID,,} ${DISTRIB_CODENAME} stable" | sudo tee /etc/apt/sources.list.d/influxdb.list
+sudo apt update
+sudo apt install influxdb -y
+sudo systemctl enable influxdb
+sudo systemctl start influxdb
+sudo apt install influxdb-client
+```
+
+By default,InfluxDB it is reachable at `localhost:8086`. Before using the 
+`influx` client, a new user with admin privileges needs to be created. 
+This user will serve for high level management, creating databases and users.
+
+```sh
+curl -XPOST "http://localhost:8086/query" --data-urlencode "q=CREATE USER username WITH PASSWORD 'password' WITH ALL PRIVILEGES"
+```
+
+Now the influx client can be used to enter [InfluxDB shell](https://docs.influxdata.com/influxdb/v1.8/tools/shell/) 
+with the new user.
+
+```sh
+influx -username 'username' -password 'password'
+```
+
+A database and user for geth metrics can be created by communicating 
+with it directly via its shell.
+
+```sh
+create database geth
+create user geth with password choosepassword
+```
+
+Verify created entries with:
+
+```
+show databases
+show users
+```
+
+Leave InfluxDB shell.
+
+```sh
+exit
+```
+
+InfluxDB is running and configured to store metrics from Geth.
+
+## Preparing Geth {#preparing-geth}
+
+After setting up database, metrics need to be enabled in Geth. 
+Various options are available, as documented in the `METRICS AND STATS OPTIONS` 
+in `geth --help` and in our [metrics page](/docs/interface/metrics). In this case Geth will be configured 
+to push data into InfluxDB. Basic setup specifies the endpoint where InfluxDB is 
+reachable and authenticates the database.
+
+```sh
+geth --metrics --metrics.influxdb --metrics.influxdb.endpoint "http://0.0.0.0:8086" --metrics.influxdb.username "geth" --metrics.influxdb.password "chosenpassword"
+```
+
+These flags can be provided when Geth is started or saved to the configuration 
+file.
+
+Listing the metrics in the database verifies that Geth is pushing data correctly. 
+In InfluxDB shell:
+
+```sh
+use geth
+show measurements
+```
+
+## Setting up Grafana {#setting-up-grafana}
+
+With the InfluxDB database setup and successfully receiving data from Geth, 
+the next step is to install Grafana so that the data can be visualized.
+
+The following code snippet shows how to download, install and 
+run Grafana on a Debian based Linux system. Up to date instructions for
+your operating system can be found on the Grafana 
+[downloads page](https://grafana.com/grafana/download).
+
+```sh
+curl -tlsv1.3 --proto =https -sL https://packages.grafana.com/gpg.key | sudo apt-key add -
+echo "deb https://packages.grafana.com/oss/deb stable main" | sudo tee -a /etc/apt/sources.list.d/grafana.list
+sudo apt update
+sudo apt install grafana
+sudo systemctl enable grafana-server
+sudo systemctl start grafana-server
+```
+
+When Grafana is up and running, it should be reachable at `localhost:3000`. 
+A browser can be pointed to that URL to access a visualization dashboard.
+
+The browser will prompt for login credentials (use user: `admin` and password: `admin`). 
+When prompted, the default password should be changed and saved.
+
+The browser first redirects to the Grafana home page to set up the source data. 
+Click on the "Data sources" icon and then click on "InfluxDB". The following
+configuration options are recommended:
+
+```sh
+Name: InfluxDB
+Query Language: InfluxQL
+
+HTTP
+  URL: http://localhost:8086
+  Access: Server (default)
+  Whitelisted cookies: None (leave blank)
+
+Auth
+  All options left as their default (switches off)
+
+Custom HTTP Headers
+  None
+
+InfluxDB Details
+  Database: geth
+  User: <your-user-name>
+  Password: <your-password>
+  HTTP Method: GET
+
+```
+
+Click on "Save and test" and wait for the confirmation to pop up.
+
+Grafana is now set up to read data from InfluxDB. Now a dashboard can be created 
+to interpret and display it. Dashboards properties are encoded in JSON files
+which can be created by anybody and easily imported. On the left bar, 
+click on the "Dashboards" icon, then "Import".
+
+For a Geth monitoring dashboard, copy the URL of [this dashboard](https://grafana.com/grafana/dashboards/13877/) 
+and paste it in the "Import page" in Grafana. After saving the dashboard, 
+it should look like this:
+
+![Grafana 1](/static/images/grafana1.png)
+
+
+## Customization
+
+The dashboards can be customized further. Each panel can be edited, moved, 
+removed or added. To learn more about how dashboards work, refer to 
+[Grafana's documentation](https://grafana.com/docs/grafana/latest/dashboards/).
+
+Some users might also be interested in automatic [alerting](https://grafana.com/docs/grafana/latest/alerting/), 
+which sets up alert notifications that are sent automatically when metrics 
+reach certain values. Various communication channels are supported.
+
+## Summary
+
+This page has outlined how to set up a simple node monitoring dashboard 
+using Grafana.
+
+
+***NB: this page was adapted from a tutorial on ethereum.org written by Mario Havel***

static/styles/custom/common.css

@@ -112,3 +112,10 @@ img[alt="Clef signing logic"] {
     margin-bottom: 2rem;
 
 }
+
+img[alt="Grafana 1"] {
+    width: 800px;
+    margin-top: 2rem;
+    margin-bottom: 2rem;
+
+}