I want to monitor .hprof files in the system using Grafana, so I wrote a small Flask app. I am able to access localhost, I am able to see the number of hprof files on terminal, but I cannot see the number of hprof files on my localhost. Here is my code:

```py
import fnmatch,os
app = Flask(__name__)

@app.route('/')
def hprof():
    num_files = len(fnmatch.filter(os.listdir("/home/ubuntu/files"),'*.hprof'))
    return("Total hprof files: ", num_files)

if __name__ == '__main__':
   app.run(host='0.0.0.0', port=8000, debug=True)

```

```
ubuntu@ubuntu-virtual-machine:~/hprof$ python3 hprof.py
 * Serving Flask app "hprof" (lazy loading)
 * Environment: production
   WARNING: This is a development server. Do not use it in a production deployment.
   Use a production WSGI server instead.
 * Debug mode: on
 * Running on http://0.0.0.0:8000/ (Press CTRL+C to quit)
 * Restarting with stat
 * Debugger is active!
 * Debugger PIN: 284-945-814
127.0.0.1 - - [15/Aug/2022 11:58:05] "GET / HTTP/1.1" 3 -

```

What I see on localhost:

```
Total hprof files: 

```

Can anyone briefly explain how to solve my problem?