Added total running time to gunicorn shutdown hooks (#2365)

* Added total running time to gunicorn shutdown hooks

* Formatting with ruff (testing it out)

* Fixing import order

gunicorn_config.py

@@ -1,5 +1,6 @@
 import os
 import sys
+import time
 import traceback
 
 import gunicorn  # type: ignore
@@ -15,7 +16,12 @@
 # Guincorn sets the server type on our app. We don't want to show it in the header in the response.
 gunicorn.SERVER = "Undisclosed"
 
-on_aws = os.environ.get("NOTIFY_ENVIRONMENT", "") in ["production", "staging", "scratch", "dev"]
+on_aws = os.environ.get("NOTIFY_ENVIRONMENT", "") in [
+    "production",
+    "staging",
+    "scratch",
+    "dev",
+]
 if on_aws:
     # To avoid load balancers reporting errors on shutdown instances, see AWS doc
     # > We also recommend that you configure the idle timeout of your application
@@ -46,6 +52,9 @@
     graceful_timeout = 85
     timeout = 90
 
+# Start timer for total running time
+start_time = time.time()
+
 
 def on_starting(server):
     server.log.info("Starting Notifications API")
@@ -58,7 +67,9 @@ def worker_abort(worker):
 
 
 def on_exit(server):
+    elapsed_time = time.time() - start_time
     server.log.info("Stopping Notifications API")
+    server.log.info("Total gunicorn running time: {:.2f} seconds".format(elapsed_time))
 
 
 def worker_int(worker):