SIENTIAPDE-1083: add prometheus metrics to opc_manager.

ingestor/metrics.py

@@ -1,11 +1,7 @@
 from prometheus_client import Counter, Gauge, Histogram
 
-# It's useful to have a common set of labels, like the pod_id.
-# We'll add 'pod_id' to many metrics to distinguish instances.
 POD_ID_LABEL = ["pod_id"]
 SERVER_LABELS = ["pod_id", "server_name", "server_url"]
-SLOT_LABELS = ["pod_id", "slot_id"]
-TAG_LABELS = ["pod_id", "server_name", "tag_id", "tag_name"]
 KAFKA_LABELS = ["pod_id", "topic"]
 REDIS_LABELS = ["pod_id", "operation"]
 NOTIFICATION_LABELS = ["pod_id", "level", "block"]
@@ -37,17 +33,14 @@ APP_UP = Gauge(
 ACTIVE_INGESTORS = Gauge(
     "ingestor_active_total",
     "Number of active ingestors reported by Redis",
-    # No pod_id here, as it's a global view from Redis
 )
 SLOTS_TOTAL = Gauge(
     "ingestor_slots_total",
     "Total number of slots configured in Redis",
-    # No pod_id here, as it's a global view from Redis
 )
 LEASES_TOTAL = Gauge(
     "ingestor_leases_total",
     "Total number of leases (allocated slots) in Redis",
-    # No pod_id here, as it's a global view from Redis
 )
 SLOTS_MANAGED = Gauge(
     "ingestor_slots_managed_current",
@@ -101,19 +94,6 @@ OPC_TAGS_SUBSCRIBED = Gauge(
     "Current number of OPC tags subscribed on a server",
     ["pod_id", "server_name"],
 )
-OPC_DATACHANGE_NOTIFICATIONS = Counter(
-    "opc_datachange_notifications_total",
-    "Total data change notifications received (tag readings)",
-    TAG_LABELS,
-)
-OPC_TAG_LAST_VALUE = Gauge(
-    "opc_tag_last_value", "The last value read from an OPC tag", TAG_LABELS
-)
-OPC_TAG_LAST_READ_TIMESTAMP = Gauge(
-    "opc_tag_last_read_timestamp_seconds",
-    "Timestamp of the last value read from an OPC tag",
-    TAG_LABELS,
-)
 OPC_CYCLES_WITHOUT_DATA = Gauge(
     "opc_cycles_without_data",
     "Current number of cycles without receiving data from a server",