SIENTIAPDE-1325

Update metrics.py to reorganize OPC Manager metrics section

- Added a comment header for OPC Manager metrics for better code organization.
- Removed redundant comment header to streamline the code structure.

ingestor/metrics.py

@@ -85,6 +85,8 @@ SLOTS_RELEASED = Counter(
     'Total number of slots released by this instance',
     POD_ID_LABEL,
 )
+
+# --- OPC Manager Metrics ---
 OPC_MANAGERS_ACTIVE = Gauge(
     'ingestor_opc_managers_active',
     'Number of active OPC Managers in this instance',
@@ -96,7 +98,6 @@ OPC_SUBSCRIPTION_ERRORS = Counter(
     ['pod_id', 'server', 'slot'],
 )
 
-# --- OPC Manager Metrics ---
 OPC_CONNECTIONS_TOTAL = Counter(
     'opc_connections_initiated_total',
     'Total connection attempts to OPC servers',