[release-2.37.0][BEAM-13980] Re-add method gone missing in af2f8ee (#16918) (#16967)

Co-authored-by: Janek Bevendorff <janek.bevendorff@uni-weimar.de>

Author: TheNeuralBit

sdks/python/apache_beam/io/aws/clients/s3/boto3_client.py

@@ -78,6 +78,31 @@ def __init__(self, options):
     self._download_stream = None
     self._download_pos = 0
 
+  def get_object_metadata(self, request):
+    """Retrieves an object's metadata.
+
+    Args:
+      request: (GetRequest) input message
+
+    Returns:
+      (Object) The response message.
+    """
+    kwargs = {'Bucket': request.bucket, 'Key': request.object}
+
+    try:
+      boto_response = self.client.head_object(**kwargs)
+    except Exception as e:
+      raise messages.S3ClientError(str(e), get_http_error_code(e))
+
+    item = messages.Item(
+        boto_response['ETag'],
+        request.object,
+        boto_response['LastModified'],
+        boto_response['ContentLength'],
+        boto_response['ContentType'])
+
+    return item
+
   def get_stream(self, request, start):
     """Opens a stream object starting at the given position.
 

website/www/site/content/en/blog/beam-2.36.0.md

@@ -51,6 +51,7 @@ notes](https://issues.apache.org/jira/secure/ReleaseNote.jspa?projectId=12319527
 * Users may encounter an unexpected java.lang.ArithmeticException when outputting a timestamp
   for an element further than allowedSkew from an allowed DoFN skew set to a value more than
   Integer.MAX_VALUE.
+* S3 object metadata retrieval broken in Python SDK ([BEAM-13980](https://issues.apache.org/jira/browse/BEAM-13980))
 * See a full list of open [issues that affect](https://issues.apache.org/jira/issues/?jql=project%20%3D%20BEAM%20AND%20affectedVersion%20%3D%202.36.0%20ORDER%20BY%20priority%20DESC%2C%20updated%20DESC) this version.