Context
If you are not careful to explicitly exclude certain user agents, you can very quickly end up with volumes of statistics that are more or less biased.
List of user agents to exclude
I suggest you add a blacklist to all the websites you are going to track with Matomo. Go to Admin, Websites then Settings. In the Global list of user agents to exclude field, enter :
/bot|spider|crawl|scanner|Headless/i