import logging
from prometheus_fastapi_instrumentator import Instrumentator


def register(app):
    # Prometheus metric prefix is : freeleaps_metrics
    instrumentator = (
        Instrumentator().instrument(
            app,
            metric_namespace="freeleaps",
            metric_subsystem="metrics", )
    )

    @app.on_event("startup")
    async def startup():
        instrumentator.expose(app, endpoint="/api/_/metrics", should_gzip=True)
        logging.info("Metrics endpoint exposed at /api/_/metrics")