Add metrics about bytes transfer

src/saturn_engine/worker/executors/arq/executor.py

@@ -2,13 +2,15 @@
 
 import asyncio
 import dataclasses
+import pickle
 
 import aioredis.errors
 from arq import create_pool
 from arq.connections import ArqRedis
 from arq.connections import RedisSettings
 from arq.jobs import Job
 from arq.jobs import JobStatus
+from opentelemetry.metrics import get_meter
 
 from saturn_engine.core import PipelineResults
 from saturn_engine.utils.asyncutils import TasksGroup
@@ -46,11 +48,38 @@ def __init__(self, options: Options, services: Services) -> None:
         self.options = options
         self.config = LazyConfig([{ARQ_EXECUTOR_NAMESPACE: self.options}])
 
+        meter = get_meter("saturn.metrics")
+        self.execute_bytes = meter.create_counter(
+            name="saturn.executor.arq.execute",
+            unit="By",
+            description="""
+            Total bytes sent to the executor
+            """,
+        )
+
+        self.results_bytes = meter.create_counter(
+            name="saturn.executor.arq.results",
+            unit="By",
+            description="""
+            Total bytes received from the executor
+            """,
+        )
+
         if services.s.hooks.executor_initialized:
             self.logger.warning(
                 "ARQExecutor does not support executor_initialized hooks"
             )
 
+    def serialize(self, obj: dict[str, t.Any]) -> bytes:
+        data = pickle.dumps(obj)
+        self.execute_bytes.add(len(data), {"executor": self.name})
+        return data
+
+    def deserialize(self, data: bytes) -> dict[str, t.Any]:
+        self.results_bytes.add(len(data), {"executor": self.name})
+        obj = pickle.loads(data)
+        return obj
+
     @cached_property
     async def redis_queue(self) -> ArqRedis:
         return await create_pool(RedisSettings.from_dsn(self.options.redis_url))

src/saturn_engine/worker/topics/rabbitmq.py

@@ -14,6 +14,7 @@
 import aio_pika
 import aio_pika.abc
 import aio_pika.exceptions
+from opentelemetry.metrics import get_meter
 
 from saturn_engine.core import TopicMessage
 from saturn_engine.utils.asyncutils import SharedLock
@@ -104,6 +105,7 @@ def __init__(self, options: Options, services: Services, **kwargs: object) -> No
         self.attempt_by_message: LRUDefaultDict[str, int] = LRUDefaultDict(
             cache_len=1024, default_factory=lambda: 0
         )
+
         self.queue_arguments: dict[str, t.Any] = self.options.arguments
 
         if self.options.max_length:
@@ -114,6 +116,22 @@ def __init__(self, options: Options, services: Services, **kwargs: object) -> No
             )
         self.queue_arguments.setdefault("x-overflow", self.options.overflow)
 
+        meter = get_meter("saturn.metrics")
+        self.publish_bytes_counter = meter.create_counter(
+            name="saturn.topics.rabbitmq.publish",
+            unit="By",
+            description="""
+            Total bytes sent on this topic.
+            """,
+        )
+        self.received_bytes_counter = meter.create_counter(
+            name="saturn.topics.rabbitmq.received",
+            unit="By",
+            description="""
+            Total bytes received on this topic.
+            """,
+        )
+
     async def open(self) -> None:
         await self.ensure_queue()
 
@@ -131,6 +149,9 @@ async def run(self) -> AsyncGenerator[t.AsyncContextManager[TopicMessage], None]
                     async for message in queue_iter:
                         attempt = 0
                         yield self.message_context(message)
+                        self.received_bytes_counter.add(
+                            message.body_size, {"topic": self.name}
+                        )
             except Exception:
                 self.logger.exception("Failed to consume")
                 await self.backoff_sleep(attempt)
@@ -167,6 +188,7 @@ async def publish(
                         ),
                         routing_key=self.options.routing_key or self.options.queue_name,
                     )
+                    self.publish_bytes_counter.add(len(body), {"topic": self.name})
                     return True
                 except aio_pika.exceptions.DeliveryError as e:
                     # Only handle Nack