Minecraft wiki entry for SpawnTracker, associated text:  cooldown_ticks: The number of ticks before the warning_level can be increased again. Decreases by 1 every tick. It is set to 200 game ticks (10 seconds) every time the warning level is increased.
 ticks_since_last_warning: The number of ticks since the player was warned for warden spawning. Increases by 1 every tick. After 12000 game ticks (10 minutes) it will be set back to 0, and the warning_level will be decreased by 1.
 warning_level: A warning level between 0 and 3 (inclusive). The warden will spawn at level 3.