With U.S. stock futures trading lower this morning on Wednesday, some of the stocks that may grab investor focus today are as follows: Wall Street expects Dollar Tree, Inc. (NASDAQ:DLTR) to report quarterly earnings at $1.04 per share on revenue of $7.49 billion before the opening bell, according to data from Benzinga Pro. Dollar Tree shares rose 1.4% to $82.75 in after-hours trading.PagerDuty Inc (NYSE:PD) reported better-than-expected earnings for its second quarter, while sales missed estimates. The company said it expects third-quarter revenue to be in the range of $115.5 million to $117.5…