As far as I can see from that link, the recall only applies to slow release Metformin in 14 batches from one company called Teva.
No reason to assume there is any of the contaminant in any slow release Metformin that may be in your house, unless it is produced by Teva AND has batch codes to match those on the recall.
May be worth mentioning that the announcement specifically mentions bottles of the pills. Therefore, if your Metformin is supplied in blister packs, then you don't have the Metformin in question.
This is from the link:
Company Announcement
Teva Pharmaceuticals USA, Inc. is voluntarily recalling fourteen (14) lots of Metformin Hydrochloride Extended-Release Tablets, USP 500 mg and 750 mg, 100 and 1000 count bottles, in the United States to the consumer-level due to the detection of N-Nitrosodimethylamine (NDMA) levels in excess of the Acceptable Daily Intake Limit (ADI).
The link also has the batch codes and pictures of the labels.