metrics: Make metrics actually usable

core/core/management/commands/update_metrics.py

@@ -1,8 +0,0 @@
-from django.core.management.base import BaseCommand, CommandError
-from core.metrics import update_item_count
-
-class Command(BaseCommand):
-    help = "Refresh the metrics"
-    
-    def handle(self, *args, **options):
-        update_item_count()

core/core/metrics.py

@@ -1,11 +1,16 @@
-from prometheus_client import Gauge
-from django_prometheus import exports
-from inventory.models import *
+from django.apps import apps
+from prometheus_client.core import CounterMetricFamily, REGISTRY
 
-g_items_total = Gauge('c3lf_items_total', 'Current Total items')
+class ModelCountCollector(object):
 
-def update_item_count():
-    # Get the count of MyModel objects
-    count = Item.objects.count()
-    # Set the gauge to the current count
-    g_items_total.set(count)
+    def collect(self):
+        counter = CounterMetricFamily('model_count', 'Number of objects per model', labels=['model', 'app'])
+        yield counter
+        if not apps.models_ready or not apps.apps_ready:
+            return
+        for app_name, app_config in apps.app_configs.items():
+            for model in app_config.get_models():
+                counter.add_metric([model.__name__, app_name], model.objects.count())
+        yield counter
+
+REGISTRY.register(ModelCountCollector())

core/core/settings.py

@@ -70,7 +70,6 @@ INSTALLED_APPS = [
     'inventory',
     'mail',
     'notify_sessions',
-    'core'
 ]
 
 REST_FRAMEWORK = {

deploy/ansible/playbooks/deploy-c3lf-sys3.yml

@@ -311,16 +311,6 @@
       notify:
         - restart c3lf-sys3
 
-    - name: add c3lf-sys3-cron service
-      template:
-        src: templates/c3lf-sys3-cron.service.j2
-        dest: /etc/systemd/system/c3lf-sys3-cron.service
-
-    - name: add c3lf-sys3-cron timer
-      template:
-        src: templates/c3lf-sys3-cron.timer.j2
-        dest: /etc/systemd/system/c3lf-sys3-cron.timer
-
     - name: reload systemd
       systemd:
         daemon_reload: yes

deploy/ansible/playbooks/templates/c3lf-sys3-cron.service.j2

@@ -1,13 +0,0 @@
-[Unit]
-Description=c3lf sys3 background service
-After=network.target
-
-[Service]
-User=www-data
-Group=www-data
-WorkingDirectory=/var/www/c3lf-sys3
-ExecStart=/var/www/c3lf-sys3/venv/bin/python3 /var/www/c3lf-sys3/repo/core/manage.py update_metrics
-Environment=DJANGO_SETTINGS_MODULE=core.settings
-
-[Install]
-WantedBy=multi-user.target

deploy/ansible/playbooks/templates/c3lf-sys3-cron.timer.j2

@@ -1,9 +0,0 @@
-[Unit]
-Description=Run Nextcloud cron.php every 5 minutes
-
-[Timer]
-OnCalendar=minutely
-Unit=c3lf-sys3-cron.service
-
-[Install]
-WantedBy=timers.target