Changing oid's SMTP When creating a new pool in the F5 LTM v11.2

Guys I work with F5 3 years ago and am having a problem with the OID's SMTP. Today the graphs of active connections of the pool F5 being collected via MRTG.

The problem occurs when I created a new pool the OID "s three specific pool also changes and I have on hand is always updating.

Is there any solution for this? I'm working on a cash Assets and liabilities in LTM v11.2. I ask for help.