Just Jira burndowns. We tracked ALL our work as tickets. Obviously story points aren't rock solid indicators, but we were basing it off a couple of years of data. For months before the pandemic there was a pretty solid line, then after months of working from home that line visibly raised. The org, who didn't look at our Jira data, also commented that stuff was coming out quicker. Of course there could have been other factors too, but that's what we saw.