alert/max_mtes_per_autoabap_run is a SAP Parameter attribute which is used to control Maximum MTEs processed in one autoabap run (0 ... no restriction). information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
Number of processed MTEs can be limited not to overload CCMS dispatcher
SAPMSSY8. If the value of the parameter is equal to 0, then there is no
restriction set and SAPMSSY8 can process all relevant MTEs.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.