Prometheus integration for Starlette in python

Introduction
Prometheus integration for Starlette.
Requirements
- Python 3.6+
- Starlette 0.9+
Installation
$ pip install starlette-prometheus
Usage
A complete example that exposes prometheus metrics endpoint under /metrics/
path.
from starlette.applications import Starlette
from starlette_prometheus import metrics, PrometheusMiddleware
app = Starlette()
app.add_middleware(PrometheusMiddleware)
app.add_route("/metrics/", metrics)
Metrics for paths that do not match any Starlette route can