Fun fact, from Wikipedia I stumbled to Mistral

Made a guess that it is written in Prolog and googled that guess. Yes it is. (en-wiki,pdf )

Mistral [59] is an expert system to monitor dam safety, developed in the 1990s by Ismes (Italy). It gets data from an automatic monitoring system and performs a diagnosis of the state of the dam. Its first copy, installed in 1992 on the Ridracoli Dam (Italy), is still operational 24/7/365. It has been installed on several dams in Italy and abroad (e.g., Itaipu Dam in Brazil), and on landslide sites under the name of Eydenet,[60] and on monuments under the name of Kaleidos.[61] Mistral is a registered trade mark of CESI.