Identifying the LTM node a vserver runs on in an iRule

I have a cluster of two active/active LTMs from which I'd like to pull some stats from (which I generate with an iRule). The iRule is applied to two virtual servers, normally one of them runs on one LTM, and the other VS on the other LTM. However, in the case of a failure, both virtual servers will run on the same LTM node, so if I grab the stats from both virtual servers then, I will actually be double counting everything. I'd like to avoid that.

So what I was thinking was to have the stats generating iRule output some marker that identified the LTM node it was running from. For example by printing its hostname. Then, in the stats gathering system, I could then simply discard any counters that would have a duplicate marker value.

However I haven't been able to find any variable or function that will allow me to identify the LTM node executing the iRule so far. Is there any such thing, or any other solution to my problem?