According to Bitcoinist.com and 1ml.com, "Bitcoin off-chain scaling solution the Lightning Network (LN) has reached a record $5 million in capacity as Bitcoin price rises fuel enthusiasm across the board.".
It feels slightly disingenuous to say that prise rises are fuelling enthusiasm when part of that $5 million figure will be coming from the price rise itself. If the price dropped down again tomorrow, it wouldn't mean that fewer people were using it. It's probably best to stick to using BTC to measure the overall capacity. That will avoid any moving goalposts.