GraphiteSink can specify which tags to export into the metrics prefix

This Jira is a feature proposal to add the ability in GraphiteSink to specify which Tag (Name/Value) pairs are to be flattened in the metric prefix.

The motivation for this is that currently, all the tags are included in the prefix like this : graphite_prefix.Context=$context.Process=$process.Tag1=$value1.Tag2=$value2..Tag9=$value9.metric

This requires a bunch of rewriting rules (and complex regexp) in the metric aggregation servers (carbon-relay, carbon-aggregator, ...) .

The feature would be exactly the same as the solution implemented in the GangliaSink : https://issues.apache.org/jira/browse/HADOOP-7507
See also the commit : https://github.com/apache/hadoop/commit/2ca9c8d926a8eeb871b2868e6eb4dfb97d7dc63d