I pass on info like the examples youve given if my batting partner may not be aware of it/faced it yet. If a bowler looks like they are getting tired or has particular tells for
variations ill pass on what ive noticed . Otherwise I just encourage my partner to keep going or compliment them on a good shot from the previous over . With guys that struggle to focus for long periods i set them small goals to count in our pertnership. Beyond that i sometimes just talk rubbish , crack a joke or talk about what to do that night etc. You learn peoples likes and dislikes and adjust where possible too. I have one mate who needs to click our bats together after every over and guys who wont ever bump gloves , or guys who have to bump gloves every over , yada yada yada.