exec.vu.tags: Tags not overwritten consistently by System Tags

[mstoykov]

Feature Description

after #2172 there will be a way for script code to add tags to be emitted for all metrics emitted by the vu, this, unfortunately, has some tags that it just won't work with such as :

• url for HTTP requests
• check for checks

Both of those as can be seen just overwrite the tag as long as it's enabled in system tags.

This isn't true for all tags, for example name actually gets checked (twice) and won't be overwritten.

I haven't checked anything else but I would expect there will be more of this :).

Suggested Solution (optional)

This is in practice the current behaviour for tags set in the Params AFAIK, so I guess it isn't really all that big of a problem.

Still, it might be good to it be known and to think about whether we want to change that.

[codebien]

I checked all the system tags that we currently have and all of them are relying only on the Has method. The unique exception is name as reported in the description. I don't think we plan to change that logic around name so I'm closing this.