Hey,

we have labels in Hawkular-metrics right now, but apparently there are
use cases that are not yet covered (and I know Matt has more)

• Listing keys of tags. Currently one has to know the available keys to be able to list the available values
• tag values are currently a comma-separated string and not an array, which may have implications on allowed characters and escaping of separators
• Post-tagging of data points (tagging could be provoked by another system that e.g. parses log files and sees an anomaly) The idea behind it is that one should be able to create tags at certain points in time for a single metric or a list of metrics to uniquely identify that point in time for queries (relative performance of two versions of a deployment).

What else?