Extend existing Prometheus labels to include tags

**Is it a duplicate question?**
No

**Is your feature request related to a problem? Please describe.**
The Prometheus exporter has a set list of tags, this should be made more dynamic

**Describe the solution you'd like**
Any tag added to a check becomes a Prometheus Label.  This will allow for filtering upstream.

**Describe alternatives you've considered**
Related to #202 and #84 
