I'm new to using tealium for GA implementation and just have a best practice question, which i think is fairly basic but I just want to make sure I get it right.
I want to implement a custom metric and the metric only fires on a specific page, the confirmation page.
My main Tealium GA tag has the load rule to fire on all pages on my domain but I don't want this metric to fire on all pages (it only exists on one page). How can I restric the metric to only fire on the intended page? Do I need to create a new Tealium GA tag for the page in question or is there a way I can restrict the metric in the existing tag?
There should only be one GA tag, and unless really required by your implementation(which in my estiamtion is pretty rare) the norm is to ave the load rule fire on all pages.
To control when the metric is sent to GA, you control when the variable feeding the metric in the tag is populated.
You can do this by using the conditions in the extentsion to only populate with the value your want when you want.
So if you put a condition to only populate when that page appears (you can use url, or any of the data object vars you specified in your data object implemenation, or to be frank any set of conditions thatt match the circumstance), that should acheive what you want.