How to interpret dplyr message `summarise()` regrouping output by ‘x’ (override with `.groups` argument)?

I started getting a new message (see post title) when running group_by and summarise() after updating to dplyr development version 0.8.99.9003. Here is an example to recreate the output: library(tidyverse) library(hablar) df <- read_csv(“year, week, rat_house_females, rat_house_males, mouse_wild_females, mouse_wild_males 2018,10,1,1,1,1 2018,10,1,1,1,1 2018,11,2,2,2,2 2018,11,2,2,2,2 2019,10,3,3,3,3 2019,10,3,3,3,3 2019,11,4,4,4,4 2019,11,4,4,4,4”) %>% convert(chr(year,week)) %>% mutate(total_rodents = rowSums(select_if(., is.numeric))) %>% … Read more