Remove sending of task logs in otel traces (#43943)

This was sending task logs from the scheduler has two problems:

1. It blocks the scheduling loop reading remote logs -- a huge performance
   foot-gun for anyone that turns this feature on
2. Sending task logs in a span seems too large, and way too verbose to provide
   any use in a span.

airflow/config_templates/config.yml

@@ -1283,14 +1283,6 @@ traces:
       type: string
       example: ~
       default: "False"
-    otel_task_log_event:
-      description: |
-        If True, after the task is complete, the full task log messages will be added as the
-        span events, chunked by 64k size. defaults to False.
-      version_added: 2.10.0
-      type: string
-      example: ~
-      default: "False"
 secrets:
   description: ~
   options:

airflow/jobs/scheduler_job_runner.py

@@ -799,31 +799,6 @@ def process_executor_events(
 
             with Trace.start_span_from_taskinstance(ti=ti) as span:
                 cls._set_span_attrs__process_executor_events(span, state, ti)
-                if conf.has_option("traces", "otel_task_log_event") and conf.getboolean(
-                    "traces", "otel_task_log_event"
-                ):
-                    from airflow.utils.log.log_reader import TaskLogReader
-
-                    task_log_reader = TaskLogReader()
-                    if task_log_reader.supports_read:
-                        metadata: dict[str, Any] = {}
-                        logs, metadata = task_log_reader.read_log_chunks(ti, ti.try_number, metadata)
-                        if ti.hostname in dict(logs[0]):
-                            message = str(dict(logs[0])[ti.hostname]).replace("\\n", "\n")
-                            while metadata["end_of_log"] is False:
-                                logs, metadata = task_log_reader.read_log_chunks(
-                                    ti, ti.try_number - 1, metadata
-                                )
-                                if ti.hostname in dict(logs[0]):
-                                    message = message + str(dict(logs[0])[ti.hostname]).replace("\\n", "\n")
-                            if span.is_recording():
-                                span.add_event(
-                                    name="task_log",
-                                    attributes={
-                                        "message": message,
-                                        "metadata": str(metadata),
-                                    },
-                                )
 
             # There are two scenarios why the same TI with the same try_number is queued
             # after executor is finished with it:

newsfragments/43943.significant.rst

@@ -0,0 +1,5 @@
+Remove the ``traces`` ``otel_task_log_event`` event config option and feature
+
+This was sending the task logs form the scheduler, and would be a huge
+scheduling performance hit (blocking the entire all scheduling while it was
+fetching logs to attach to the trace)