Your group has metrics same as your personal profile?
Specifically, your community shows activity. This is a real eye opener once you start gauging it. Something I personally want to get to mimic my personal activity. Dark Green.
Go to your community setting, metrics, then scroll down to the bottom. If you are on desktop, you can hover over the squares and see how many activities were done in that particular day. If you hover over the Range Squares/tiles at the bottom, it will tell you what it takes to reach that color code. For me at least, (assuming it differs), I need 96+ community activities to reach dark green.