1 files changed, 34 insertions, 0 deletions
diff --git a/lib/gitlab/database/partitioning/partition_monitoring.rb b/lib/gitlab/database/partitioning/partition_monitoring.rb
new file mode 100644
index 00000000000..9ec9ae684a5
--- /dev/null
+++ b/lib/gitlab/database/partitioning/partition_monitoring.rb
@@ -0,0 +1,34 @@
+# frozen_string_literal: true
+
+module Gitlab
+  module Database
+    module Partitioning
+      class PartitionMonitoring
+        attr_reader :models
+
+        def initialize(models = PartitionCreator.models)
+          @models = models
+        end
+
+        def report_metrics
+          models.each do |model|
+            strategy = model.partitioning_strategy
+
+            gauge_present.set({ table: model.table_name }, strategy.current_partitions.size)
+            gauge_missing.set({ table: model.table_name }, strategy.missing_partitions.size)
+          end
+        end
+
+        private
+
+        def gauge_present
+          @gauge_present ||= Gitlab::Metrics.gauge(:db_partitions_present, 'Number of database partitions present')
+        end
+
+        def gauge_missing
+          @gauge_missing ||= Gitlab::Metrics.gauge(:db_partitions_missing, 'Number of database partitions currently expected, but not present')
+        end
+      end
+    end
+  end
+end