Improve celery infos on Dashboard

allianceauth/authentication/task_statistics/signals.py

@@ -0,0 +1,42 @@
+from celery.signals import task_failure, task_retry, task_success, worker_ready
+
+from django.conf import settings
+
+from .event_series import FailedTaskSeries, RetriedTaskSeries, SucceededTaskSeries
+
+
+def reset_counters():
+    """Reset all counters for the celery status."""
+    SucceededTaskSeries().clear()
+    FailedTaskSeries().clear()
+    RetriedTaskSeries().clear()
+
+
+def is_enabled() -> bool:
+    return not bool(
+        getattr(settings, "ALLIANCEAUTH_DASHBOARD_TASK_STATISTICS_DISABLED", False)
+    )
+
+
+@worker_ready.connect
+def reset_counters_when_celery_restarted(*args, **kwargs):
+    if is_enabled():
+        reset_counters()
+
+
+@task_success.connect
+def record_task_succeeded(*args, **kwargs):
+    if is_enabled():
+        SucceededTaskSeries().add()
+
+
+@task_retry.connect
+def record_task_retried(*args, **kwargs):
+    if is_enabled():
+        RetriedTaskSeries().add()
+
+
+@task_failure.connect
+def record_task_failed(*args, **kwargs):
+    if is_enabled():
+        FailedTaskSeries().add()