While Metrictank takes in tag metadata in the form of metrics2.0 and indexes it, it is not exposed yet for querying. There will be various benefits in adopting metrics2.0 fully (better choices for consolidation, data conversion, supplying unit information to Grafana, etc) see Tags

Current limitations: manual promotions, statically defined peers, per-instance primary status instead of per-shard, so you can't shuffle shard replicas across nodes. see clustering for more info)