nwaku/apps/sonda/README.md

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# Sonda
Sonda is a tool to monitor store nodes and measure their performance.
It works by running a `nwaku` node, publishing a message from it every fixed interval and performing a store query to all the store nodes we want to monitor to check they respond with the last message we published.
## Instructions
1. Create an `.env` file which will contain the configuration parameters.
You can start by copying `.env.example` and adapting it for your use case
```
cp .env.example .env
${EDITOR} .env
```
The variables that have to be filled for Sonda are
```
CLUSTER_ID=
SHARD=
# Comma separated list of store nodes to poll
STORE_NODES=
# Wait time in seconds between two consecutive queries
QUERY_DELAY=
# Consecutive successful store requests to consider a store node healthy
HEALTH_THRESHOLD=
```
2. If you want to query nodes in `cluster-id` 1, then you have to follow the steps of registering an RLN membership. Otherwise, you can skip this step.
For it, you need:
* Ethereum Sepolia WebSocket endpoint. Get one free from [Infura](https://www.infura.io/).
* Ethereum Sepolia account with some balance <0.01 Eth. Get some [here](https://www.infura.io/faucet/sepolia).
* A password to protect your rln membership.
Fill the `RLN_RELAY_ETH_CLIENT_ADDRESS`, `ETH_TESTNET_KEY` and `RLN_RELAY_CRED_PASSWORD` env variables and run
```
./register_rln.sh
```
3. Start Sonda by running
```
docker-compose up -d
```
4. Browse to http://localhost:3000/dashboards and monitor the performance
There's two Grafana dashboards: `nwaku-monitoring` to track the stats of your node that is publishing messages and performing queries, and `sonda-monitoring` to monitor the responses of the store nodes.