Support Librato "stat level tags"

[CloudNiner]

It appears that its not currently possible to create a tag of the form:

my.metric#service=web,app_version=1.12:42

and have it passed on to Librato via statsite and the built-in Librato sink. Librato's statsd plugin states that "in order to use tags, the statsd config option keyNameSanitize must be set to false to properly parse tags out of your stat name." In order to support this feature in statsite, it seems that two changes are necessary:

1. Update the statsite configuration to support a parameter similar to keyNameSanitize.
2. Update the statsite Librato sink to support sending tagged metrics. Tags don't appear to be parsed from the keys sent to the sink.

See:

• https://www.librato.com/docs/kb/faq/glossary/whats_a_tag/
• https://www.librato.com/docs/kb/collect/collection_agents/stastd/#stat-level-tags
• https://www.librato.com/docs/api/?shell#create-a-measurement

[bryanmikaelian]

Thanks for bringing this up @CloudNiner. Librato currently has a fork with updates to our sink here:

https://github.com/librato/statsite/blob/master/sinks/librato.py

We are still rolling tags out to more customers but do plan to merge our changes upstream in the near future. @jderrett can be your point person if you have any issues with the sink.