Update app.py

Author: Gurram2001

app/app.py

@@ -1,4 +1,5 @@
 from flask import Flask
+from prometheus_flask_exporter import PrometheusMetrics
 
 app = Flask(__name__)
 
@@ -7,4 +8,4 @@ def hello():
     return "Hello from DevOps on Azure VM with CI/CD!"
 
 if __name__ == '__main__':
-    app.run(host='0.0.0.0', port=5000)
+    app.run(host='0.0.0.0', port=5000)