Hi @mckinley ,
grant2 already provide solution for you. You just need to adjust bucket name and tag, so in your case your query for dashboard variable should look like:
import "influxdata/influxdb/schema"
schema.tagValues(
bucket: "bucket1",
tag: "agent_host"
)
and all unique agents should be displayed.
You can take a look at influxdb schema tagvalues documentation.
Everything is done in Grafana ( open dashboard → Settings → Variables → New variable ). Nothing will be changed or written in influxdb.
Best regards,
ldrascic