RMQ: Added Prometheus metrics and cleaned up code for deployment

src/metrics.py

@@ -0,0 +1,39 @@
+from prometheus_client import Counter, Gauge, start_http_server
+from logger_handler import setup_logger
+import asyncio
+
+logger = setup_logger(__name__)
+
+MSG_PUBLISHED = Counter(
+	"rmq_messages_published_total",
+	"Total number of messages successfully published to RabbitMQ"
+)
+
+MSG_FAILED = Counter(
+	"rmq_messages_failed_total",
+	"Total number of messages sent to the dead-letter queue"
+)
+
+MSG_RETRY = Counter(
+	"rmq_messages_retry_total",
+	"Total number of messages retried via retry queue",
+	["queue_name", "uuid", "retry_count"]
+)
+
+QUEUE_MESSAGES = Gauge(
+	"rmq_queue_messages",
+	"Current number of messages pending in the queue",
+	["queue_name"]
+)
+
+def start_metrics_server(port: int = 9000):
+	start_http_server(port)
+	logger.info(f"Prometheus metrics exposed at http://0.0.0.0:{port}/metrics")
+
+async def update_queue_gauge(channel, queue_name: str):
+	"""Periodically update queue depth"""
+	queue = await channel.declare_queue(queue_name, passive=True)
+	while True:
+		info = await queue.declare()
+		QUEUE_MESSAGES.labels(queue_name=queue_name).set(info.message_count)
+		await asyncio.sleep(10)