Remove images count (which is horribly slow in InnoDB) and add a max gauge

workers/globalpromstats.py

@@ -7,7 +7,6 @@ from data.database import UseThenDisconnect
 from data import model
 from data.model.image import total_image_count
 from util.locking import GlobalLock, LockNotAcquiredException
-from workers.securityworker import images_gauge
 from workers.worker import Worker
 
 logger = logging.getLogger(__name__)
@@ -43,8 +42,6 @@ class GlobalPrometheusStatsWorker(Worker):
       metric_queue.org_count.Set(model.organization.get_active_org_count())
       metric_queue.robot_count.Set(model.user.get_robot_count())
 
-      images_gauge.Set(total_image_count())
-
 
 def main():
   logging.config.fileConfig('conf/logging_debug.conf', disable_existing_loggers=False)

workers/securityworker.py

@@ -21,8 +21,8 @@ INDEXING_INTERVAL = 30
 logger = logging.getLogger(__name__)
 unscanned_images_gauge = prometheus.create_gauge('unscanned_images',
                                                  'Number of images that clair needs to scan.')
-images_gauge = prometheus.create_gauge('all_images', 'Total number of images that clair can scan.')
-
+max_unscanned_images_gauge = prometheus.create_gauge('max_unscanned_image_id',
+                                                     'Max ID of the unscanned images.')
 
 class SecurityWorker(Worker):
   def __init__(self):
@@ -49,6 +49,8 @@ class SecurityWorker(Worker):
     if max_id is None:
       return
 
+    max_unscanned_images_gauge.Set(max_id)
+
     with UseThenDisconnect(app.config):
       to_scan_generator = yield_random_entries(
         batch_query,