Add metrics for view/task time

src/pretix/base/services/async.py

@@ -15,25 +15,31 @@ import time
 from django.conf import settings
 from django.db import transaction
 
-from pretix.base.metrics import celery_task_runs
+from pretix.base.metrics import celery_task_runs, celery_task_times
 from pretix.celery_app import app
 
 
 class ProfiledTask(app.Task):
     def __call__(self, *args, **kwargs):
+
         if settings.PROFILING_RATE > 0 and random.random() < settings.PROFILING_RATE / 100:
             profiler = cProfile.Profile()
             profiler.enable()
-            starttime = time.time()
+            t0 = time.perf_counter()
             ret = super().__call__(*args, **kwargs)
+            tottime = time.perf_counter() - t0
             profiler.disable()
-            tottime = time.time() - starttime
             profiler.dump_stats(os.path.join(settings.PROFILE_DIR, '{time:.0f}_{tottime:.3f}_celery_{t}.pstat'.format(
                 t=self.name, tottime=tottime, time=time.time()
             )))
-            return ret
         else:
-            return super().__call__(*args, **kwargs)
+            t0 = time.perf_counter()
+            ret = super().__call__(*args, **kwargs)
+            tottime = time.perf_counter() - t0
+
+        if settings.METRICS_ENABLED:
+            celery_task_times.observe(tottime, task_name=self.name)
+        return ret
 
     def on_failure(self, exc, task_id, args, kwargs, einfo):
         if settings.METRICS_ENABLED:

src/pretix/base/services/cart.py

@@ -1,7 +1,6 @@
 from collections import Counter, namedtuple
 from datetime import timedelta
 from decimal import Decimal
-
 from typing import List, Optional
 
 from celery.exceptions import MaxRetriesExceededError