chronicler
n.a person who writes about events as they happen, especially to record history or a specific period of time. You use this for someone who keeps a detailed record of what is going on.
n.a person who records events as they occur, typically in a systematic or historical manner. Often used to describe writers or journalists who document a specific era or social movement.
“The local newspaper is a chronicler of the town's history.”
“As a chronicler of the digital revolution, she documented how social media changed the way people communicate.”
“The poet served as a chronicler of the city's shifting landscape, capturing the essence of urban life through verse that remains a vital historical record of the era.”
“Fans saw him as a frank chronicler of inner-city life, while his detractors regarded his music as a glorification of drug use and gang violence.”
From chronicle + -er.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.