pasquier-s bde64cf5a6 Fix Kubernetes endpoints SD for empty subsets (#3660)
* Fix Kubernetes endpoints SD for empty subsets

When an endpoints object has no associated pods (replica scaled to zero
for instance), the endpoints SD should return a target group with no
targets so that the SD manager propagates this information to the scrape
manager.

Fixes #3659

* Don't send nil target groups from the Kubernetes SD

This is to be consistent with the endpoints SD part.
2018-01-30 15:00:33 +00:00
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