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docs/tutorials/visualizing-node-metrics: Update to Prometheus endpoint #461

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docs/tutorials/visualizing-node-metrics: Update to Prometheus endpoint
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147 changes: 96 additions & 51 deletions docs/tutorials/visualizing-node-metrics.md
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title: "Visualizing Node Metrics"
---

Recent versions of Substrate record metrics, such as how many peers your node
is connected to, how much memory your node is using, etc. To visualize these
metrics, you can use a tool called [Grafana](https://grafana.com/).
Recent versions of Substrate expose metrics, such as how many peers your node is
connected to, how much memory your node is using, etc. To visualize these
metrics, you can use tools like [Prometheus](https://prometheus.io/) and
[Grafana](https://grafana.com/).

## Step 1: Install and run Grafana
> Note: In the past Substrate exposed a Grafana JSON endpoint directly. This has
> been replaced with a Prometheus metric endpoint.

If you're on
macOS, the easiest way to do that is via [Homebrew](https://brew.sh/):
A possible architecture could look like:

```bash
brew install grafana
```
+-----------+ +-------------+ +---------+
| Substrate | | Prometheus | | Grafana |
+-----------+ +-------------+ +---------+
| -----------------\ | |
| | Every 1 minute |-| |
| |----------------| | |
| | |
| GET current metric values | |
|<---------------------------------| |
| | |
| `substrate_peers_count 5` | |
|--------------------------------->| |
| | --------------------------------------------------------------------\ |
| |-| Save metric value with corresponding time stamp in local database | |
| | |-------------------------------------------------------------------| |
| | -------------------------------\ |
| | | Every time user opens graphs |-|
| | |------------------------------| |
| | |
| | GET values of metric `substrate_peers_count` from time-X to time-Y |
| |<-------------------------------------------------------------------------|
| | |
| | `substrate_peers_count (1582023828, 5), (1582023847, 4) [...]` |
| |------------------------------------------------------------------------->|
| | |
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Maybe some of the designers can help us out with this? @goldsteinsveta

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This is ultimately beautiful, but sure, I'll draw a scheme by the end of Friday

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While I do agree that my diagram has a lot of room for improvement, I also want to emphasize the fact that one has to view it in markdown mode, otherwise tabs will not align properly.

This is ultimately beautiful

❤️

I'll draw a scheme by the end of Friday

🎉 @goldsteinsveta let me know if you need more details. I would expect the content to change a bit in the future, thus in case it is hard to do this in a way that is not easy to adapt, it might make sense to hold off a bit longer?


Grafana runs via a server, which you can run via `brew` with:

```bash
brew services start grafana
```

Downloads for other platforms are available [here](https://grafana.com/grafana/download).
<details>
<summary>Reproduce diagram</summary>

## Step 2: Install the Grafana JSON DataSource plugin:
Go to: https://textart.io/sequence

We use a simple JSON interface to serve metrics. The
[Grafana JSON DataSource](https://github.com/simPod/grafana-json-datasource) plugin can be
installed with:
```
object Substrate Prometheus Grafana
note left of Prometheus: Every 1 minute
Prometheus->Substrate: GET current metric values
Substrate->Prometheus: `substrate_peers_count 5`
note right of Prometheus: Save metric value with corresponding time stamp in local database
note left of Grafana: Every time user opens graphs
Grafana->Prometheus: GET values of metric `substrate_peers_count` from time-X to time-Y
Prometheus->Grafana: `substrate_peers_count (1582023828, 5), (1582023847, 4) [...]`
```

</details>

```bash
grafana-cli plugins install simpod-json-datasource
```

## Step 3: Run your node

## Step 1: Run your node

As long as you're running a version of Substrate at or after commit
<!-- TODO: Update commit hash-->
[`d9ca975`](https://github.com/paritytech/substrate/commit/d9ca9750dba018463d59459a3ee1c03b71ea2d46),
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This PR is made against the next version of the docs. When we cut a new release, it will be included in that release. Thus there is no need to specify the commit here.

a server serving metrics for Grafana will start on port `9955`. You can specify
this port with `--grafana-port <PORT>` and enable it to be accessed over a
network with `--grafana-external`.
an endpoint serving metrics in the [Prometheus exposition
format](https://prometheus.io/docs/concepts/data_model/) will be available on
port `9615`. You can change the port with `--prometheus-port <PORT>` and enable
it to be accessed over an interface other than local host with
`--prometheus-external`.

## Step 4: Set Up Grafana
```bash
./substrate
```

We will not cover setting up and running Grafana in great detail - there's the
[Getting Started guide](https://grafana.com/docs/guides/getting_started/) for
that. Here are a few pointers though:
## Step 2: Retrieve the metrics

1. On the 'Add data source' screen, select the JSON data source in the
'Others' section.
2. Set the url of the running servers (e.g.
`http://localhost:9955`)
> NOTE: just `locahost::<PORT>` won't work.
3. Click `Save & Test`.
In a second terminal run:

Grafana should ping the server and show that the data source is working:
```bash
curl localhost:9615/metrics
```

![Data Source Config](/docs/assets/tutorials/grafana/datasource-config.png)
Which should return a similar output to:

Creating queries is a lot simpler than in other data sources. Simply click the
drop-down and select the metric you want to visualize:
```
# HELP substrate_block_height_number Height of the chain
# TYPE substrate_block_height_number gauge
substrate_block_height_number{status="best"} 12591
substrate_block_height_number{status="finalized"} 11776
substrate_block_height_number{status="sync_target"} 1236089
# HELP substrate_cpu_usage_percentage Node CPU usage
# TYPE substrate_cpu_usage_percentage gauge
substrate_cpu_usage_percentage 98.90908813476563
# HELP substrate_memory_usage_bytes Node memory usage
# TYPE substrate_memory_usage_bytes gauge
substrate_memory_usage_bytes 195504
# HELP substrate_network_per_sec_bytes Networking bytes per second
# TYPE substrate_network_per_sec_bytes gauge
substrate_network_per_sec_bytes{direction="download"} 4117
substrate_network_per_sec_bytes{direction="upload"} 437
# HELP substrate_peers_count Number of network gossip peers
# TYPE substrate_peers_count gauge
substrate_peers_count 3
# HELP substrate_ready_transactions_number Number of transactions in the ready queue
# TYPE substrate_ready_transactions_number gauge
substrate_ready_transactions_number 0
```

![Creating a query](/docs/assets/tutorials/grafana/metric-selection.png)
## Next Steps

## Step 5: Create Your Dashboard
### Configure Prometheus to scrape your Substrate node

Once you've done all that, you should be able to make a pretty neat node
dashboard!
https://prometheus.io/docs/guides/node-exporter/#configuring-your-prometheus-instances

![Node Dashboard](/docs/assets/tutorials/grafana/dashboard.png)

There's a lot of work still to be done on the metrics system. Hopefully, in the
future you'll be able to log metrics from anywhere in the node runtime to a
variety of databases, such as [Prometheus](https://prometheus.io/).
### Visualizing Prometheus metrics with Grafana

If you have any suggestions, feel free to file an issue on
[the substrate repository](https://github.com/paritytech/substrate).
https://prometheus.io/docs/visualization/grafana/

## Next Steps

### Learn More

- Learn how to [set up a private Substrate network](start-a-private-network).

### Examples

- Take a look at the Grafana dashboard configuration for the [Polkadot network](https://github.com/w3f/polkadot-dashboard).
- Take a look at the Grafana dashboard configuration for the [Polkadot
network](https://github.com/w3f/polkadot-dashboard).

### References

<!-- TODO: Update this to RUSTDOC link-->

- Visit the source code for [grafana-data-source](https://github.com/paritytech/substrate/tree/master/client/grafana-data-source).
- Visit the source code for
[grafana-data-source](https://github.com/paritytech/substrate/tree/master/client/grafana-data-source).