Remove telemetry and tracing dependencies from Task and Flow classes

- Remove telemetry-related imports and private attributes from Task class
- Remove `_telemetry` attribute from Flow class
- Update event handling to emit events without direct telemetry tracking
- Simplify task and flow execution by removing explicit telemetry spans
- Move telemetry-related event handling to EventListener

src/crewai/flow/flow.py

@@ -29,6 +29,7 @@ from crewai.utilities.events import (
     FlowStartedEvent,
     MethodExecutionFinishedEvent,
     MethodExecutionStartedEvent,
+    FlowCreatedEvent,
 )
 from crewai.utilities.events.event_bus import event_bus
 from crewai.utilities.printer import Printer
@@ -428,7 +429,6 @@ class Flow(Generic[T], metaclass=FlowMeta):
 
     Type parameter T must be either Dict[str, Any] or a subclass of BaseModel."""
 
-    _telemetry = Telemetry()
     _printer = Printer()
 
     _start_methods: List[str] = []
@@ -469,7 +469,13 @@ class Flow(Generic[T], metaclass=FlowMeta):
         if kwargs:
             self._initialize_state(kwargs)
 
-        self._telemetry.flow_creation_span(self.__class__.__name__)
+        event_bus.emit(
+            self,
+            FlowCreatedEvent(
+                type="flow_created",
+                flow_name=self.__class__.__name__,
+            ),
+        )
 
         # Register all flow-related methods
         for method_name in dir(self):
@@ -759,19 +765,13 @@ class Flow(Generic[T], metaclass=FlowMeta):
         if not self._start_methods:
             raise ValueError("No start method defined")
 
-        self._telemetry.flow_execution_span(
-            self.__class__.__name__, list(self._methods.keys())
-        )
-
         tasks = [
             self._execute_start_method(start_method)
             for start_method in self._start_methods
         ]
         await asyncio.gather(*tasks)
-        print(f"All method outputs: {self._method_outputs}")  # Debug log
 
         final_output = self._method_outputs[-1] if self._method_outputs else None
-        print("final_output", final_output)
 
         event_bus.emit(
             self,
@@ -1029,8 +1029,8 @@ class Flow(Generic[T], metaclass=FlowMeta):
         elif level == "warning":
             logger.warning(message)
 
-    def plot(self, filename: str = "crewai_flow") -> None:
-        self._telemetry.flow_plotting_span(
+    def plot(self, filename: str = "crewai_flow") -> None: 
+        Telemetry().flow_plotting_span(
             self.__class__.__name__, list(self._methods.keys())
         )
         plot_flow(self, filename)

src/crewai/task.py

@@ -21,7 +21,6 @@ from typing import (
     Union,
 )
 
-from opentelemetry.trace import Span
 from pydantic import (
     UUID4,
     BaseModel,
@@ -36,7 +35,6 @@ from crewai.agents.agent_builder.base_agent import BaseAgent
 from crewai.tasks.guardrail_result import GuardrailResult
 from crewai.tasks.output_format import OutputFormat
 from crewai.tasks.task_output import TaskOutput
-from crewai.telemetry.telemetry import Telemetry
 from crewai.tools.base_tool import BaseTool
 from crewai.utilities.config import process_config
 from crewai.utilities.converter import Converter, convert_to_model
@@ -189,8 +187,6 @@ class Task(BaseModel):
                     )
         return v
 
-    _telemetry: Telemetry = PrivateAttr(default_factory=Telemetry)
-    _execution_span: Optional[Span] = PrivateAttr(default=None)
     _original_description: Optional[str] = PrivateAttr(default=None)
     _original_expected_output: Optional[str] = PrivateAttr(default=None)
     _original_output_file: Optional[str] = PrivateAttr(default=None)
@@ -363,9 +359,6 @@ class Task(BaseModel):
                 )
 
             self.start_time = datetime.datetime.now()
-            self._execution_span = self._telemetry.task_started(
-                crew=agent.crew, task=self
-            )
 
             self.prompt_context = context
             tools = tools or self.tools or []
@@ -438,29 +431,20 @@ class Task(BaseModel):
             if crew and crew.task_callback and crew.task_callback != self.callback:
                 crew.task_callback(self.output)
 
-            if self._execution_span:
-                self._telemetry.task_ended(self._execution_span, self, agent.crew)
-                self._execution_span = None
-
-                if self.output_file:
-                    content = (
-                        json_output
-                        if json_output
-                        else pydantic_output.model_dump_json()
-                        if pydantic_output
-                        else result
-                    )
-                    self._save_file(content)
+            if self.output_file:
+                content = (
+                    json_output
+                    if json_output
+                    else pydantic_output.model_dump_json()
+                    if pydantic_output
+                    else result
+                )
+                self._save_file(content)
             event_bus.emit(self, TaskCompletedEvent(output=task_output))
             return task_output
         except Exception as e:
             self.end_time = datetime.datetime.now()
-            if self._execution_span:
-                if agent and agent.crew:
-                    self._telemetry.task_ended(self._execution_span, self, agent.crew)
-                self._execution_span = None
-
-            event_bus.emit(self, TaskFailedEvent(task=self, error=str(e)))
+            event_bus.emit(self, TaskFailedEvent(error=str(e)))
             raise e  # Re-raise the exception after emitting the event
 
     def prompt(self) -> str:

src/crewai/utilities/events/__init__.py

@@ -16,6 +16,7 @@ from .agent_events import (
 )
 from .task_events import TaskStartedEvent, TaskCompletedEvent, TaskFailedEvent
 from .flow_events import (
+    FlowCreatedEvent,
     FlowStartedEvent,
     FlowFinishedEvent,
     MethodExecutionStartedEvent,

src/crewai/utilities/events/crew_events.py

@@ -92,4 +92,3 @@ class CrewTestFailedEvent(CrewEvent):
     error: str
     crew_name: Optional[str]
     type: str = "crew_test_failed"
-

src/crewai/utilities/events/event_listener.py

@@ -1,9 +1,7 @@
-from re import S
 from pydantic import PrivateAttr
 
 from crewai.telemetry.telemetry import Telemetry
 from crewai.utilities import Logger
-from crewai.utilities.evaluators.task_evaluator import TaskEvaluator
 from crewai.utilities.events.base_event_listener import BaseEventListener
 
 from .agent_events import AgentExecutionCompletedEvent, AgentExecutionStartedEvent
@@ -19,12 +17,13 @@ from .crew_events import (
     CrewTrainStartedEvent,
 )
 from .flow_events import (
+    FlowCreatedEvent,
     FlowFinishedEvent,
     FlowStartedEvent,
     MethodExecutionFinishedEvent,
     MethodExecutionStartedEvent,
 )
-from .task_events import TaskCompletedEvent, TaskStartedEvent
+from .task_events import TaskCompletedEvent, TaskFailedEvent, TaskStartedEvent
 
 
 class EventListener(BaseEventListener):
@@ -120,15 +119,44 @@ class EventListener(BaseEventListener):
                 event.timestamp,
                 color=self.color,
             )
-
+        
+        @event_bus.on(TaskStartedEvent)
+        def on_task_started(source, event: TaskStartedEvent):
+            source._execution_span = self._telemetry.task_started(
+                crew=source.agent.crew, task=source
+            )
+            context = event.context
+            self.logger.log(
+                f"📋 Task started: {source.description} Context: {context}",
+                event.timestamp,
+                color=self.color,
+            )
+            
+         
+        
         @event_bus.on(TaskCompletedEvent)
         def on_task_completed(source, event: TaskCompletedEvent):
-            self._telemetry.task_ended(source._execution_span, source, source)
+            if source._execution_span:
+                self._telemetry.task_ended(source._execution_span, source, source.agent.crew)
             self.logger.log(
                 f"📋 Task completed: {source.description}",
                 event.timestamp,
                 color=self.color,
             )
+            source._execution_span = None
+            
+        @event_bus.on(TaskFailedEvent)
+        def on_task_failed(source, event: TaskFailedEvent):
+            if source._execution_span:
+                if source.agent and source.agent.crew:
+                    self._telemetry.task_ended(source._execution_span, source, source.agent.crew)
+                source._execution_span = None
+            self.logger.log(
+                f"❌ Task failed: {source.description}",
+                event.timestamp,
+                color=self.color,
+            )
+
 
         @event_bus.on(AgentExecutionStartedEvent)
         def on_agent_execution_started(source, event: AgentExecutionStartedEvent):
@@ -147,8 +175,21 @@ class EventListener(BaseEventListener):
             )
 
         # Flow Events
+        
+        @event_bus.on(FlowCreatedEvent)
+        def on_flow_created(source, event: FlowCreatedEvent):
+            self._telemetry.flow_creation_span(self.__class__.__name__)
+            self.logger.log(
+                f"🌊 Flow Created: '{event.flow_name}'",
+                event.timestamp,
+                color=self.color,
+            )
+        
         @event_bus.on(FlowStartedEvent)
         def on_flow_started(source, event: FlowStartedEvent):
+            self._telemetry.flow_execution_span(
+                source.__class__.__name__, list(source._methods.keys())
+            )
             self.logger.log(
                 f"🤖 Flow Started: '{event.flow_name}'",
                 event.timestamp,

src/crewai/utilities/events/flow_events.py

@@ -20,6 +20,13 @@ class FlowStartedEvent(FlowEvent):
     type: str = "flow_started"
 
 
+
+class FlowCreatedEvent(FlowEvent):
+    """Event emitted when a flow is created"""
+
+    flow_name: str
+    type: str = "flow_created"
+
 class MethodExecutionStartedEvent(FlowEvent):
     """Event emitted when a flow method starts execution"""
 

src/crewai/utilities/events/task_events.py

@@ -1,5 +1,4 @@
 from typing import Any, Optional
-
 from crewai.utilities.events.crew_events import CrewEvent
 
 
@@ -8,7 +7,6 @@ class TaskStartedEvent(CrewEvent):
 
     type: str = "task_started"
     context: Optional[str]
-    model_config = {"arbitrary_types_allowed": True}
 
 
 
@@ -18,12 +16,11 @@ class TaskCompletedEvent(CrewEvent):
     output: Any
     type: str = "task_completed"
 
-    model_config = {"arbitrary_types_allowed": True}
 
 
 class TaskFailedEvent(CrewEvent):
     """Event emitted when a task fails"""
 
-    task: Any
     error: str
     type: str = "task_failed"
+

tests/utilities/cassettes/test_task_emits_failed_event_on_execution_error.yaml

@@ -1,13 +1,19 @@
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+    headers:
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+      - DYNAMIC
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+      - keep-alive
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+      - gzip
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+      - application/json
+      Date:
+      - Thu, 13 Feb 2025 23:11:16 GMT
+      Server:
+      - cloudflare
+      Transfer-Encoding:
+      - chunked
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+      - nosniff
+      access-control-expose-headers:
+      - X-Request-ID
+      alt-svc:
+      - h3=":443"; ma=86400
+      openai-organization:
+      - crewai-iuxna1
+      openai-processing-ms:
+      - '618'
+      openai-version:
+      - '2020-10-01'
+      strict-transport-security:
+      - max-age=31536000; includeSubDomains; preload
+      x-ratelimit-limit-requests:
+      - '30000'
+      x-ratelimit-limit-tokens:
+      - '150000000'
+      x-ratelimit-remaining-requests:
+      - '29999'
+      x-ratelimit-remaining-tokens:
+      - '149998444'
+      x-ratelimit-reset-requests:
+      - 2ms
+      x-ratelimit-reset-tokens:
+      - 0s
+      x-request-id:
+      - req_b12d08242d920f524028f18e6eb2ef1a
     http_version: HTTP/1.1
     status_code: 200
 version: 1

tests/utilities/test_events.py

@@ -23,6 +23,7 @@ from crewai.utilities.events.crew_events import (
 from crewai.utilities.events.event_bus import event_bus
 from crewai.utilities.events.event_types import ToolUsageFinishedEvent
 from crewai.utilities.events.flow_events import (
+    FlowCreatedEvent,
     FlowFinishedEvent,
     FlowStartedEvent,
     MethodExecutionStartedEvent,
@@ -33,6 +34,7 @@ from crewai.utilities.events.task_events import (
     TaskStartedEvent,
 )
 from crewai.utilities.events.tool_usage_events import ToolUsageErrorEvent
+from requests.exceptions import RequestException
 
 base_agent = Agent(
     role="base_agent",
@@ -148,27 +150,35 @@ def test_crew_emits_end_task_event():
 @pytest.mark.vcr(filter_headers=["authorization"])
 def test_task_emits_failed_event_on_execution_error():
     received_events = []
+    received_sources = []
 
     @event_bus.on(TaskFailedEvent)
     def handle_task_failed(source, event):
         received_events.append(event)
+        received_sources.append(source)
+   
+    with patch.object(Task, "_execute_core",) as mock_execute:
+        error_message = "Simulated task failure"
+        mock_execute.side_effect = Exception(error_message)
+        agent = Agent(
+            role="base_agent",
+            goal="Just say hi",
+            backstory="You are a helpful assistant that just says hi",
+        )       
+        task = Task(
+            description="Just say hi",
+            expected_output="hi",
+            agent=agent,
+        )
+        
+        with pytest.raises(Exception):
+            agent.execute_task(task=task)
 
-    task = Task(
-        description="Just say hi",
-        expected_output="hi",
-        agent=None,
-    )
-
-    with pytest.raises(Exception) as exc_info:
-        task._execute_core(agent=None, context=None, tools=None)
-
-    assert "has no agent assigned" in str(exc_info.value)
-
-    assert len(received_events) == 1
-    assert received_events[0].task == task
-    assert "has no agent assigned" in received_events[0].error
-    assert isinstance(received_events[0].timestamp, datetime)
-    assert received_events[0].type == "task_failed"
+            assert len(received_events) == 1
+            assert received_sources[0] == task
+            assert received_events[0].error == error_message
+            assert isinstance(received_events[0].timestamp, datetime)
+            assert received_events[0].type == "task_failed"
 
 
 @pytest.mark.vcr(filter_headers=["authorization"])
@@ -439,3 +449,23 @@ def test_multiple_handlers_for_same_event():
         assert len(received_events_2) == 1
         assert received_events_1[0].type == "crew_kickoff_started"
         assert received_events_2[0].type == "crew_kickoff_started"
+
+
+def test_flow_emits_created_event():
+    received_events = []
+
+    @event_bus.on(FlowCreatedEvent)
+    def handle_flow_created(source, event):
+        received_events.append(event)
+
+    class TestFlow(Flow[dict]):
+        @start()
+        def begin(self):
+            return "started"
+
+    flow = TestFlow()
+    flow.kickoff()
+
+    assert len(received_events) == 1
+    assert received_events[0].flow_name == "TestFlow"
+    assert received_events[0].type == "flow_created"