Adds existing triggers to this set, optionally rebuilding the registry.

    Used to aggregate trigger methods from Probes to Methods to Checks.

    Args:
      other: Another Triggers object.
      callback: Registers all the updated triggers to the specified function.

def Update(self, other, callback):
    """Adds existing triggers to this set, optionally rebuilding the registry.

    Used to aggregate trigger methods from Probes to Methods to Checks.

    Args:
      other: Another Triggers object.
      callback: Registers all the updated triggers to the specified function.
    """
    self.conditions.update(other.conditions)
    self._Register(other.conditions, callback)