How do I disable "Tablespace Full" monitoring, and still have thresholds set in it to use for my met

We have our own metric extension to handle special logic for monitoring tablespaces. It returns just a warning and critical string, so the built in key based thresholds do not work for it. It basically behaves differently based on the size of the tablespace. For tablespaces of 1.5 TB or larger, it will alert on free space, and for tablespaces less than that, it will alert on percentage. We are trying to use the threshold settings on the "Tablespace Full" metrics for this metric extension, and then disable them so they don't trigger. The problem we have is that the