Promtheus endpoint

influxdb
prometheus
#1

https://docs.influxdata.com/influxdb/v1.6/supported_protocols/prometheus/

In InfluxDB v1.5 and earlier, all measurement names written from remote endpoints are prepended with an underscore ( _ ). In InfluxDB v1.6+, this is no longer the case.

Should have been mentioned in the release notes as a breaking change at least.