What is the highest gas price ever?

I'm curious, could you elaborate on the question, "What is the highest gas price ever?" Specifically, are we referring to the highest transaction fee, often called "gas price," on a blockchain network like Ethereum? And if so, have there been any notable instances where the gas price soared to unprecedented levels, perhaps due to network congestion or other factors? It would be insightful to learn about such instances and the implications they may have had on the broader cryptocurrency ecosystem.