design how to verify scheduler working well in Schrodinger

We have many test cases in Schrodinger which verify our data can't be broken, corrupted, but now we have no way to verify PD scheduler can work as expected, E.g, if a PD can't send schedule command to TiKV, we should detect this and alert us.

So I think we also need to figure out a way to verify the scheduler, alert through metrics and deploy it in Schrodinger.