The S3 QWG defines 'recommended flags' which should be considered when working with Sentinel-3 OLCI data. They asked if these recommendations can be supported by the S3TBX.
For land data:
https://sentinels.copernicus.eu/documents/247904/3588909/Sentinel-3-Product-Notice-OLCI-Level-2-NRT-and-NTC.pdf
For ocean data:
https://www-cdn.eumetsat.int/files/2020-04/pdf_s3_pn_olci_l2m_001.pdf
Should be done after reprocessing of L2 data. Which is probably finished in January. New flags will be defined.