fedimint-metrics 0.5.0

fedimint-metrics allows exporting prometheus metrics from Fedimint.
Documentation 
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# fedimint-metrics

## Introduction

This crate helps expose metrics in [prometheus](https://prometheus.io/) format for monitoring and administration of federations.

## Getting started

The easiest way to test it is to create an account on https://grafana.com/, then `Add new connection`, pick `Hosted Prometheus metrics` and `Via Grafana Agent`. Follow the instructions to create a new config and change
```yaml
- targets: ['localhost:9100']
```
to
```yaml
- targets: ['localhost:3000']
```

(or use the value given to the environment variable `FM_BIND_METRICS_API` or the `--bind-metrics-api` argument of `fedimintd`)

Then you can build dashboards using the `grafanacloud-xxx-prom` `data source`.

To make some test lightning payments, you can run
```bash
fedimint-load-test-tool load-test --generate-invoice-with ln-cli
```