Revert "feat: add prompt observability code (#2027)" (#2211)

* Revert "feat: add prompt observability code (#2027)"

This reverts commit 90f1bee602.

* Fix issues with flows post merge

* Decoupling telemetry and ensure tests  (#2212)

* feat: Enhance event listener and telemetry tracking

- Update event listener to improve telemetry span handling
- Add execution_span field to Task for better tracing
- Modify event handling in EventListener to use new span tracking
- Remove debug print statements
- Improve test coverage for crew and flow events
- Update cassettes to reflect new event tracking behavior

* Remove telemetry references from Crew class

- Remove Telemetry import and initialization from Crew class
- Delete _telemetry attribute from class configuration
- Clean up unused telemetry-related code

* test: Improve crew verbose output test with event log filtering

- Filter out event listener logs in verbose output test
- Ensure no output when verbose is set to False
- Enhance test coverage for crew logging behavior

* dropped comment

* refactor: Improve telemetry span tracking in EventListener

- Remove `execution_span` from Task class
- Add `execution_spans` dictionary to EventListener to track spans
- Update task event handlers to use new span tracking mechanism
- Simplify span management across task lifecycle events

* lint

* Fix failing test

---------

Co-authored-by: Lorenze Jay <63378463+lorenzejay@users.noreply.github.com>

src/crewai/tools/tool_usage.py

@@ -2,7 +2,6 @@ import ast
 import datetime
 import json
 import time
-from datetime import UTC
 from difflib import SequenceMatcher
 from json import JSONDecodeError
 from textwrap import dedent
@@ -118,10 +117,7 @@ class ToolUsage:
                 self._printer.print(content=f"\n\n{error}\n", color="red")
             return error
 
-        if (
-            isinstance(tool, CrewStructuredTool)
-            and tool.name == self._i18n.tools("add_image")["name"]  # type: ignore
-        ):
+        if isinstance(tool, CrewStructuredTool) and tool.name == self._i18n.tools("add_image")["name"]:  # type: ignore
             try:
                 result = self._use(tool_string=tool_string, tool=tool, calling=calling)
                 return result
@@ -158,7 +154,6 @@ class ToolUsage:
                 self.task.increment_tools_errors()
 
         started_at = time.time()
-        started_at_trace = datetime.datetime.now(UTC)
         from_cache = False
 
         result = None  # type: ignore # Incompatible types in assignment (expression has type "None", variable has type "str")
@@ -186,9 +181,7 @@ class ToolUsage:
 
                 if calling.arguments:
                     try:
-                        acceptable_args = tool.args_schema.model_json_schema()[
-                            "properties"
-                        ].keys()  # type: ignore
+                        acceptable_args = tool.args_schema.model_json_schema()["properties"].keys()  # type: ignore
                         arguments = {
                             k: v
                             for k, v in calling.arguments.items()
@@ -209,7 +202,7 @@ class ToolUsage:
                         error=e, tool=tool.name, tool_inputs=tool.description
                     )
                     error = ToolUsageErrorException(
-                        f"\n{error_message}.\nMoving on then. {self._i18n.slice('format').format(tool_names=self.tools_names)}"
+                        f'\n{error_message}.\nMoving on then. {self._i18n.slice("format").format(tool_names=self.tools_names)}'
                     ).message
                     self.task.increment_tools_errors()
                     if self.agent.verbose:
@@ -244,7 +237,6 @@ class ToolUsage:
             "result": result,
             "tool_name": tool.name,
             "tool_args": calling.arguments,
-            "start_time": started_at_trace,
         }
 
         self.on_tool_use_finished(
@@ -388,7 +380,7 @@ class ToolUsage:
                 raise
             else:
                 return ToolUsageErrorException(
-                    f"{self._i18n.errors('tool_arguments_error')}"
+                    f'{self._i18n.errors("tool_arguments_error")}'
                 )
 
         if not isinstance(arguments, dict):
@@ -396,7 +388,7 @@ class ToolUsage:
                 raise
             else:
                 return ToolUsageErrorException(
-                    f"{self._i18n.errors('tool_arguments_error')}"
+                    f'{self._i18n.errors("tool_arguments_error")}'
                 )
 
         return ToolCalling(
@@ -424,7 +416,7 @@ class ToolUsage:
                 if self.agent.verbose:
                     self._printer.print(content=f"\n\n{e}\n", color="red")
                 return ToolUsageErrorException(  # type: ignore # Incompatible return value type (got "ToolUsageErrorException", expected "ToolCalling | InstructorToolCalling")
-                    f"{self._i18n.errors('tool_usage_error').format(error=e)}\nMoving on then. {self._i18n.slice('format').format(tool_names=self.tools_names)}"
+                    f'{self._i18n.errors("tool_usage_error").format(error=e)}\nMoving on then. {self._i18n.slice("format").format(tool_names=self.tools_names)}'
                 )
             return self._tool_calling(tool_string)