A Saint Without a Surviving Life
The Orthodox Church in America's Lives of the Saints entry for November 4 lists Gabriel of Atonelni as a Georgian monk and gives his feast day, but expressly notes that no information about him is available. No dates, monastery name, or narrative of his life are provided.
He has no dedicated article on Wikipedia or OrthodoxWiki. Wikipedia's list of November 4 Eastern Orthodox commemorations includes his name, citing the OCA, but carries no further detail, and OrthodoxWiki's catalogue of Georgian saints does not list him.
The epithet 'Atonelni' appears to be a Georgian form built on 'Atoneli' (of Athos, from Georgian 'Atoni,' Mount Athos), which would suggest a Georgian Athonite monk; this reading of the name, however, is not confirmed by any documented source and remains conjectural.