if I understand your request, you don’t want to change anything, you want to know the OIDs used in the existing checks.
2 ways to see them:
- call the host on the CLI with double-verbosity "cmk -vv "
- check the source code of the check, i.e. open the service details and then check under checkmk/checks at master · tribe29/checkmk · GitHub or checkmk/cmk/base/plugins/agent_based at master · tribe29/checkmk · GitHub (there are two folders, because Checkmk has two different Check APIs, but you will find each check only in one of the two folders ;))