Datadog-agent: Feature Request: Blacklist Host Tags

[ericlarssen-wf]

It would be great if it was possible to strip off Host tags off of metrics. Tags such as what autoscaling group a metric is coming from is not very valuable and can clutter the tags for a particular metric. Being able to exclude tags based on a regex would enable to strip multiple at a time and allow to strip generated tags.

[tonglil]

To give an example, in a cattle-like environment, I don't need host, internal-hostname, instance-id, instance-template, or created-by tags on my metrics as these are highly automatically generated and cycled in the runtime environment.

Maybe I need 1 of host OR instance-id, but I'm usually not drilling down to that level, especially if I'm more concerned about high level metrics.

[hermanbanken]

We could really use this too. We have high cardinality of tags, but ALL of our metrics are annotated by the various hosts too, multiplying the whole thing enormously.

I believe all the instance-related tags are all added by the DataDog agent itself, right? Based on where the data is sourced from.