mileage notification reached

When the vehicle reaches a set mileage, I need you to send a notification on telegran. It is possible? using tk 311c tk303g

Sounds like you are looking for the maintenance notification. It is possible.

is there any documentation to teach how to set this up? if there is, i try to do

There is a little bit of documentation here:

https://www.traccar.org/documentation/events/

thank you anton i managed to work the alert.