Forms monitoring - change span to trace to put tag at highest level

[gmrabian]

I added a tag to the span and successfully found it in Datadog staging. I noticed that the tag is not easily filterable from the trace menu because it is only associated, not a property of the highest level trace. I want to add it to the trace so that it is easier for my team to filter based on this.

Previous PR to add span tag

Traces consist of one or more spans
You can get active_span or active_trace in ruby

Summary

• Change active_span getter to active_trace to tag at a higher, more filterable level

Related issue(s)

• https://app.zenhub.com/workspaces/vagov-product-team-forms-634853151f5c6000165942bc/issues/gh/department-of-veterans-affairs/va.gov-team-forms/263

Testing done

• Verified span tag shows up in Datadog. Docs imply this will help bring the tag to the overall trace.

Screenshots

Top level (rack.request) trace and tags

Lower span (rails.action_controller) with added form_id tag

What areas of the site does it impact?

None