metrics: Add ticket counters

core/core/metrics.py

@@ -2,6 +2,8 @@ from django.apps import apps
 from prometheus_client.core import CounterMetricFamily, REGISTRY
 from django.db.models import Case, Value, When, BooleanField, Count
 from inventory.models import Item
+from tickets.models import IssueThread
+
 
 class ItemCountCollector(object):
 
@@ -32,7 +34,29 @@ class ItemCountCollector(object):
 
         yield counter
 
+class TicketCountCollector(object):
+
+    def collect(self):
+        counter = CounterMetricFamily("c3lf_ticket_count", "Current number of tickets", labels=['event', 'event_id'])
+
+        yield counter
+
+        if not apps.models_ready or not apps.apps_ready:
+            return
+
+        queryset = (
+            IssueThread.objects
+                .values('event__slug', 'event_id')
+                .annotate(amount=Count('id'))
+        )
+
+        for e in queryset:
+            counter.add_metric([e["event__slug"].lower()], e["amount"])
+
+        yield counter
+
 try:
     REGISTRY.register(ItemCountCollector())
+    REGISTRY.register(TicketCountCollector())
 except Exception as e:
     print(e)