From Longman Dictionary of Contemporary Englishgoldfish bowlˈgoldfish ˌbowl noun 1 
DHP[countable] a round glass bowl in which fish are kept as pets2 [singular]PUBLIC/NOT PRIVATE a situation in which people know about everything that happens in your life Pop stars have to live their life in a goldfish bowl.
DHP[countable] a round glass bowl in which fish are kept as pets2 [singular]PUBLIC/NOT PRIVATE a situation in which people know about everything that happens in your life Pop stars have to live their life in a goldfish bowl.Examples from the Corpus
goldfish bowl• On his shelf he had a goldfish bowl with two goldfish swimming blankly around.• She long ago learned that the pressure of fame and the goldfish bowl existence it brings can take a terrible toll.• Surviving in this goldfish bowl of publicity would crack the strongest union. 