How to add a timestamp on iRule

Exactly, we want to have a way for us to validate with our control plane that the irules are effectively synchronized and are the same at all times, this, among other things, is because we need to be able to validate that if a request with a specific header enters through an F5, let's say of region A, then if it cannot satisfy the request based on the header, then to be able to evaluate before performing a fallback to the F5 of the other region (let's say B), and be able to control, among other things, that that header exists and that it can resolve it, in which case just there would proceed to perform the fallback and complete the request in the destination of region B, otherwise it would go to the default pool in the source region (in this case A).

Perhaps I am adding one more degree of complexity in the question, which would be the fallback part.