I used the code from the below link to manually call the shutdown events

https://github.com/fastapi/fastapi/discussions/11872#discussioncomment-10134866

from contextlib import asynccontextmanager
from fastapi import FastAPI

@asynccontextmanager
async def lifespan(app: FastAPI):
    yield
    for on_shutdown in  app.router.on_shutdown:
        await on_shutdown()

app = FastAPI(lifespan=lifespan)

async def get_profiler_result():
    print("On shutdown has been called")

app.add_event_handler("shutdown", get_profiler_result)

Caveat: This is just a hack. also see