Add Prometheus Metrics Endpoint for Service

[hspencer77]

Enable prometheus metrics endpoint in order to get application performance data. Reference: https://prometheus.github.io/client_python/exporting/http/fastapi-gunicorn/

[hspencer77]

Different examples:

from fastapi import FastAPI, Request
from prometheus_client import make_asgi_app, Counter

app = FastAPI()
all_requests = Counter('all_requests', 'A counter of the all requests made')
metrics_app = make_asgi_app()
app.mount("/metrics", metrics_app)

@app.middleware("http")
async def tracing(request: Request, call_next):
    all_requests.inc()
    response = await call_next(request)
    return response

from fastapi import FastAPI, Request
from prometheus_client import make_asgi_app, Counter

app = FastAPI()
all_requests = Counter('all_requests', 'A counter of the all requests made')
metrics_app = make_asgi_app()
app.mount("/metrics", metrics_app)

@app.middleware("http")
async def tracing(request: Request, call_next):
    all_requests.inc()
    response = await call_next(request)
    return response