def is_glacier(s3_client, bucket, prefix):
response = s3_client.list_objects_v2(Bucket=bucket,<EOL>Prefix=prefix,<EOL>MaxKeys=<NUM_LIT:3>)  <EOL>for key in response['<STR_LIT>']:<EOL><INDENT>if key.get('<STR_LIT>', '<STR_LIT>') == '<STR_LIT>':<EOL><INDENT>return True<EOL><DEDENT><DEDENT>return False<EOL>
Check if prefix is archived in Glacier, by checking storage class of
    first object inside that prefix

    Arguments:
    s3_client - boto3 S3 client (not service)
    bucket - valid extracted bucket (without protocol and prefix)
             example: sowplow-events-data
    prefix - valid S3 prefix (usually, run_id)
             example: snowplow-archive/enriched/archive/