Tail-sampling processor: drop spans matching an attribute

[LukeMathWalker]

It is currently possible to prescribe that spans matching a certain condition are always sampled.
As far as I can see, there is no mechanism to do the opposite (even in other processors): how do I instruct the collector to always drop spans matching a certain condition?

E.g. drop all spans where the HTTP path is /health_check.

Looking at the source, it would be fairly simple to add this functionality to the tail-sampling processor and I'd be happy to open a PR for it, but I am also aware of #1797 - what is the best way forward here?

[HuBaX]

Is anyone working on this? I'm asking because I'd like to implement this.

[github-actions]

This issue has been inactive for 60 days. It will be closed in 60 days if there is no activity. To ping code owners by adding a component label, see Adding Labels via Comments, or if you are unsure of which component this issue relates to, please ping @open-telemetry/collector-contrib-triagers. If this issue is still relevant, please ping the code owners or leave a comment explaining why it is still relevant. Otherwise, please close it.

Pinging code owners:

• processor/tailsampling: @jpkrohling

See Adding Labels via Comments if you do not have permissions to add labels yourself.

[jpkrohling]

The string attribute now has an invert_match attribute that allows you to achieve this.