Remove TaskContextLogger (#43183)

It was a fine idea, but we ultimately realized that it's better to just add records to the Log table.  These are now easy to find through the UI (see event logs).

airflow/config_templates/config.yml

@@ -1032,18 +1032,6 @@ logging:
       type: boolean
       example: ~
       default: "False"
-    enable_task_context_logger:
-      description: |
-        If enabled, Airflow may ship messages to task logs from outside the task run context, e.g. from
-        the scheduler, executor, or callback execution context. This can help in circumstances such as
-        when there's something blocking the execution of the task and ordinarily there may be no task
-        logs at all.
-        This is set to ``True`` by default. If you encounter issues with this feature
-        (e.g. scheduler performance issues) it can be disabled.
-      version_added: 2.8.0
-      type: boolean
-      example: ~
-      default: "True"
     color_log_error_keywords:
       description: |
         A comma separated list of keywords related to errors whose presence should display the line in red

airflow/utils/log/file_task_handler.py

@@ -19,7 +19,6 @@
 
 from __future__ import annotations
 
-import inspect
 import logging
 import os
 from contextlib import suppress
@@ -238,10 +237,6 @@ def set_context(self, ti: TaskInstance, *, identifier: str | None = None) -> Non
         self.handler.setLevel(self.level)
         return SetContextPropagate.MAINTAIN_PROPAGATE if self.maintain_propagate else None
 
-    @cached_property
-    def supports_task_context_logging(self) -> bool:
-        return "identifier" in inspect.signature(self.set_context).parameters
-
     @staticmethod
     def add_triggerer_suffix(full_path, job_id=None):
         """

newsfragments/43183.significant.rst

@@ -0,0 +1,5 @@
+Remove TaskContextLogger
+
+We introduced this as a way to inject messages into task logs from places
+other than the task execution context.  We later realized that we were better off
+just using the Log table.

providers/src/airflow/providers/amazon/CHANGELOG.rst

@@ -788,7 +788,7 @@ Misc
 .. Below changes are excluded from the changelog. Move them to
    appropriate section above if needed. Do not delete the lines(!):
    * ``Use reproducible builds for provider packages (#35693)``
-   * ``Update http to s3 system test (#35711)``
+     * ``Update http to s3 system test (#35711)``
 
 8.11.0
 ......

tests_common/test_utils/mock_executor.py

@@ -18,7 +18,7 @@
 from __future__ import annotations
 
 from collections import defaultdict
-from unittest.mock import MagicMock, Mock
+from unittest.mock import MagicMock
 
 from airflow.executors.base_executor import BaseExecutor
 from airflow.executors.executor_utils import ExecutorName
@@ -52,8 +52,6 @@ def __init__(self, do_update=True, *args, **kwargs):
 
         super().__init__(*args, **kwargs)
 
-        self.task_context_logger = Mock()
-
     def success(self):
         return State.SUCCESS