Logs: ObservedTimestamp field is missing in console exporter output (#3564)

* ObservedTimestamp field is not set

* Update CHANGELOG.md 

unrelease

---------

Co-authored-by: Srikanth Chekuri <[email protected]>

Author: pegasas

CHANGELOG.md

@@ -7,6 +7,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ## Unreleased
 
+- Logs: ObservedTimestamp field is missing in console exporter output
+  ([#3564](https://github.com/open-telemetry/opentelemetry-python/pull/3564))
 - Fix explicit bucket histogram aggregation
   ([#3429](https://github.com/open-telemetry/opentelemetry-python/pull/3429))
 - Add `code.lineno`, `code.function` and `code.filepath` to all logs 

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

@@ -206,6 +206,7 @@ def to_json(self, indent=4) -> str:
                 else None,
                 "dropped_attributes": self.dropped_attributes,
                 "timestamp": ns_to_iso_str(self.timestamp),
+                "observed_timestamp": ns_to_iso_str(self.observed_timestamp),
                 "trace_id": f"0x{format_trace_id(self.trace_id)}"
                 if self.trace_id is not None
                 else "",

opentelemetry-sdk/tests/logs/test_log_record.py

@@ -29,6 +29,7 @@ def test_log_record_to_json(self):
                 "attributes": None,
                 "dropped_attributes": 0,
                 "timestamp": "1970-01-01T00:00:00.000000Z",
+                "observed_timestamp": "1970-01-01T00:00:00.000000Z",
                 "trace_id": "",
                 "span_id": "",
                 "trace_flags": None,
@@ -38,6 +39,7 @@ def test_log_record_to_json(self):
         )
         actual = LogRecord(
             timestamp=0,
+            observed_timestamp=0,
             body="a log line",
         ).to_json()
         self.assertEqual(expected, actual)