Applying Zombie:Reborn (ZR)
With the remake of the Zombie:Reloaded plugin into 
CS2Fixes, a new feature has been added that allows mappers to disable (and re-enable) zombie respawns at will. This change requires modifications to the 'nukes' at the end of the map, replacing the old inconsistent trigger_hurt based automatic “repeat kill detectors”.
To modify zombie respawns, create an additional output on the entity that triggers the nuke such that:
- Action:
<OnWhatever> - Target:
zr_toggle_respawn - Output: choose one output listed below:
Disable- disable zombie respawn (does nothing if already disabled)Enable- enable zombie respawn (does nothing if already enabled)
- Delay: you can have whatever value here for the delay of the output.
Trigger output still exists for legacy purposes. However, there have been instances where the Trigger output would unintentionally re-enable zombie respawns, such as when triggered via a trigger_once. Thus, do not use the Trigger output.
It is very important to not miss this step! If this is not set up correctly, then zombies will infinitely respawn in a loop on live servers, which will make your port unplayable. Additionally, a map may have multiple ways of triggering the nuke; make sure this output is added to all such entities!
A possible way of testing zombie respawn toggles offline is to create a logic_relay with the targetname of zr_toggle_respawn. Within this relay, add an output that prints to console / chat whenever zombie respawns are modified. Make sure to delete the relay before publishing the map though, otherwise the messages will still print on live servers.