* [outputs.signalfx] Add output plugin for SignalFX
This output plugin converts the `telegraf.Metrics` into signalfx
`datapoint`s and then transmits them to the ingest servers using
signalfx golang client lib.
As of this commit, the client lib is allowed to pick sane defaults
and none of its fields are overridable via telegraf config. This
can be changed in the future if needed.
The unit tests only test for conversion of `telegraf.Metric`s to
the `datapoint` structs. All code that executes after that is
assumed to be tested in the signalfx client lib itself (and not
worth writing end-to-end tests for).
Further enhancements:
- Custom ingest urls
- Better batching
- More extensive tests
- Support for events, sent by whitelist only
Co-authored-by: Ben Keith <benkeith@splunk.com>
Co-authored-by: Akshay <akshay.moghe@gmail.com>
Co-authored-by: Jay Camp <jcamp@splunk.com>
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