def METHOD_NAME(self):
    num_stats = {
        k: v
        for k, v in self.stats._stats.items()
        if isinstance(v, (int, float))
        and self.param_allowed(k, self.ext_delta_include, self.ext_delta_exclude)
    }
    delta = {k: v - self.delta_prev.get(k, 0) for k, v in num_stats.items()}
    self.delta_prev = num_stats
    return {"delta": delta}