SIENTIAPDE-1174

Update dependencies, modify replica count, and implement metrics tracking

- Updated sientia-dataops-library version from 1.3.5 to 1.3.7 in requirements.txt.
- Changed replicaCount in values.yaml from 5 to 3 and incremented image tag from 0.2.7 to 0.3.1.
- Added Prometheus metrics tracking in gates.py and worker.py, including a new write_metrics method.
- Configured Prometheus service and ServiceMonitor in values.yaml for metrics collection.

laborious/metrics.py

@@ -0,0 +1,27 @@
+from prometheus_client import Gauge, Counter
+
+APP_UP = Gauge(
+    "app_up",
+    "Indicates if the application is running (1) or shutting down (0)",
+    ["pod_id"],
+)
+
+CORE_LABELS = ["pod_id", "model_name", "pipeline_name"]
+
+PREDICTIONS_WRITTEN_COUNT = Counter(
+    "laborious_predictions_written_count",
+    "Number of predictions written to the database table predictions",
+    CORE_LABELS,
+)
+
+PREDICTION_CONFIDENCE_MONITOR = Gauge(
+    "laborious_prediction_confidence_monitor",
+    "Current confidence of each prediction",
+    CORE_LABELS,
+)
+
+PREDICTION_RESPONSE_TIME_MONITOR = Gauge(
+    "laborious_prediction_response_time_monitor",
+    "Current response time of each prediction",
+    CORE_LABELS,
+)