Update LogRecord API to set and make use of context to set trace id / span id / trace flags, (#4668)

Author: DylanRussell

CHANGELOG.md

@@ -25,7 +25,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Update logger level to NOTSET in logs example
   ([#4637](https://github.com/open-telemetry/opentelemetry-python/pull/4637))
 - Logging API accepts optional `context`; deprecates `trace_id`, `span_id`, `trace_flags`.
-  ([#4597](https://github.com/open-telemetry/opentelemetry-python/pull/4597))
+  ([#4597](https://github.com/open-telemetry/opentelemetry-python/pull/4597)) and 
+  ([#4668](https://github.com/open-telemetry/opentelemetry-python/pull/4668))
 - sdk: use context instead of trace_id,span_id for initializing LogRecord
   ([#4653](https://github.com/open-telemetry/opentelemetry-python/pull/4653))
 - Rename LogRecordProcessor.emit to on_emit

opentelemetry-api/src/opentelemetry/_logs/_internal/__init__.py

@@ -42,8 +42,10 @@
 from typing_extensions import deprecated
 
 from opentelemetry._logs.severity import SeverityNumber
+from opentelemetry.context import get_current
 from opentelemetry.context.context import Context
 from opentelemetry.environment_variables import _OTEL_PYTHON_LOGGER_PROVIDER
+from opentelemetry.trace import get_current_span
 from opentelemetry.trace.span import TraceFlags
 from opentelemetry.util._once import Once
 from opentelemetry.util._providers import _load_provider
@@ -107,14 +109,17 @@ def __init__(
         attributes: Optional[_ExtendedAttributes] = None,
         event_name: Optional[str] = None,
     ) -> None:
+        if not context:
+            context = get_current()
+        span_context = get_current_span(context).get_span_context()
         self.timestamp = timestamp
         if observed_timestamp is None:
             observed_timestamp = time_ns()
         self.observed_timestamp = observed_timestamp
         self.context = context
-        self.trace_id = trace_id
-        self.span_id = span_id
-        self.trace_flags = trace_flags
+        self.trace_id = trace_id or span_context.trace_id
+        self.span_id = span_id or span_context.span_id
+        self.trace_flags = trace_flags or span_context.trace_flags
         self.severity_text = severity_text
         self.severity_number = severity_number
         self.body = body