Add metrics instrumentation celery (#1679)

Co-authored-by: Shalev Roda <65566801+shalevr@users.noreply.github.com>

CHANGELOG.md

@@ -7,6 +7,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+
 ### Added
 
 - Make Flask request span attributes available for `start_span`. 
@@ -16,6 +17,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Instrument all httpx versions >= 0.18. ([#1748](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/1748))
 - Fix `Invalid type NoneType for attribute X  (opentelemetry-instrumentation-aws-lambda)` error when some attributes do not exist
   ([#1780](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/1780))
+- Add metric instrumentation for celery
+  ([#1679](https://github.com/open-telemetry/opentelemetry-python-contrib/pull/1679))
 
 ## Version 1.18.0/0.39b0 (2023-05-10)
 

instrumentation/opentelemetry-instrumentation-celery/src/opentelemetry/instrumentation/celery/__init__.py

@@ -60,6 +60,7 @@ API
 """
 
 import logging
+from timeit import default_timer
 from typing import Collection, Iterable
 
 from celery import signals  # pylint: disable=no-name-in-module
@@ -69,6 +70,7 @@ from opentelemetry.instrumentation.celery import utils
 from opentelemetry.instrumentation.celery.package import _instruments
 from opentelemetry.instrumentation.celery.version import __version__
 from opentelemetry.instrumentation.instrumentor import BaseInstrumentor
+from opentelemetry.metrics import get_meter
 from opentelemetry.propagate import extract, inject
 from opentelemetry.propagators.textmap import Getter
 from opentelemetry.semconv.trace import SpanAttributes
@@ -104,6 +106,11 @@ celery_getter = CeleryGetter()
 
 
 class CeleryInstrumentor(BaseInstrumentor):
+    def __init__(self):
+        super().__init__()
+        self.metrics = None
+        self.task_id_to_start_time = {}
+
     def instrumentation_dependencies(self) -> Collection[str]:
         return _instruments
 
@@ -113,6 +120,11 @@ class CeleryInstrumentor(BaseInstrumentor):
         # pylint: disable=attribute-defined-outside-init
         self._tracer = trace.get_tracer(__name__, __version__, tracer_provider)
 
+        meter_provider = kwargs.get("meter_provider")
+        meter = get_meter(__name__, __version__, meter_provider)
+
+        self.create_celery_metrics(meter)
+
         signals.task_prerun.connect(self._trace_prerun, weak=False)
         signals.task_postrun.connect(self._trace_postrun, weak=False)
         signals.before_task_publish.connect(
@@ -139,6 +151,7 @@ class CeleryInstrumentor(BaseInstrumentor):
         if task is None or task_id is None:
             return
 
+        self.update_task_duration_time(task_id)
         request = task.request
         tracectx = extract(request, getter=celery_getter) or None
 
@@ -153,8 +166,7 @@ class CeleryInstrumentor(BaseInstrumentor):
         activation.__enter__()  # pylint: disable=E1101
         utils.attach_span(task, task_id, (span, activation))
 
-    @staticmethod
-    def _trace_postrun(*args, **kwargs):
+    def _trace_postrun(self, *args, **kwargs):
         task = utils.retrieve_task(kwargs)
         task_id = utils.retrieve_task_id(kwargs)
 
@@ -178,6 +190,9 @@ class CeleryInstrumentor(BaseInstrumentor):
 
         activation.__exit__(None, None, None)
         utils.detach_span(task, task_id)
+        self.update_task_duration_time(task_id)
+        labels = {"task": task.name, "worker": task.request.hostname}
+        self._record_histograms(task_id, labels)
 
     def _trace_before_publish(self, *args, **kwargs):
         task = utils.retrieve_task_from_sender(kwargs)
@@ -277,3 +292,30 @@ class CeleryInstrumentor(BaseInstrumentor):
         # Use `str(reason)` instead of `reason.message` in case we get
         # something that isn't an `Exception`
         span.set_attribute(_TASK_RETRY_REASON_KEY, str(reason))
+
+    def update_task_duration_time(self, task_id):
+        cur_time = default_timer()
+        task_duration_time_until_now = (
+            cur_time - self.task_id_to_start_time[task_id]
+            if task_id in self.task_id_to_start_time
+            else cur_time
+        )
+        self.task_id_to_start_time[task_id] = task_duration_time_until_now
+
+    def _record_histograms(self, task_id, metric_attributes):
+        if task_id is None:
+            return
+
+        self.metrics["flower.task.runtime.seconds"].record(
+            self.task_id_to_start_time.get(task_id),
+            attributes=metric_attributes,
+        )
+
+    def create_celery_metrics(self, meter) -> None:
+        self.metrics = {
+            "flower.task.runtime.seconds": meter.create_histogram(
+                name="flower.task.runtime.seconds",
+                unit="seconds",
+                description="The time it took to run the task.",
+            )
+        }

instrumentation/opentelemetry-instrumentation-celery/tests/test_metrics.py

@@ -0,0 +1,76 @@
+import threading
+import time
+from timeit import default_timer
+
+from opentelemetry.instrumentation.celery import CeleryInstrumentor
+from opentelemetry.test.test_base import TestBase
+
+from .celery_test_tasks import app, task_add
+
+
+class TestMetrics(TestBase):
+    def setUp(self):
+        super().setUp()
+        self._worker = app.Worker(
+            app=app, pool="solo", concurrency=1, hostname="celery@akochavi"
+        )
+        self._thread = threading.Thread(target=self._worker.start)
+        self._thread.daemon = True
+        self._thread.start()
+
+    def tearDown(self):
+        super().tearDown()
+        self._worker.stop()
+        self._thread.join()
+
+    def get_metrics(self):
+        result = task_add.delay(1, 2)
+
+        timeout = time.time() + 60 * 1  # 1 minutes from now
+        while not result.ready():
+            if time.time() > timeout:
+                break
+            time.sleep(0.05)
+        return self.get_sorted_metrics()
+
+    def test_basic_metric(self):
+        CeleryInstrumentor().instrument()
+        start_time = default_timer()
+        task_runtime_estimated = (default_timer() - start_time) * 1000
+
+        metrics = self.get_metrics()
+        CeleryInstrumentor().uninstrument()
+        self.assertEqual(len(metrics), 1)
+
+        task_runtime = metrics[0]
+        print(task_runtime)
+        self.assertEqual(task_runtime.name, "flower.task.runtime.seconds")
+        self.assert_metric_expected(
+            task_runtime,
+            [
+                self.create_histogram_data_point(
+                    count=1,
+                    sum_data_point=task_runtime_estimated,
+                    max_data_point=task_runtime_estimated,
+                    min_data_point=task_runtime_estimated,
+                    attributes={
+                        "task": "tests.celery_test_tasks.task_add",
+                        "worker": "celery@akochavi",
+                    },
+                )
+            ],
+            est_value_delta=200,
+        )
+
+    def test_metric_uninstrument(self):
+        CeleryInstrumentor().instrument()
+        metrics = self.get_metrics()
+        self.assertEqual(len(metrics), 1)
+        CeleryInstrumentor().uninstrument()
+
+        metrics = self.get_metrics()
+        self.assertEqual(len(metrics), 1)
+
+        for metric in metrics:
+            for point in list(metric.data.data_points):
+                self.assertEqual(point.count, 1)