Accepts names in the form: /<cluster>/<labels>/<port-name>/residual/path
Accepts names in the form: /<cluster>/<labels>/<port-name>/residual/path
and initiates a polling loop against the SDS API. The labels segment must be a :: delimited list of label:value pairs. To avoid duplication, the labels must be in alphabetical order by label name. e.g.
/foo.default.svc.cluster.local/az:us-west::env:prod::version:v1/http
Use :: alone to specify an empty list of labels
/foo.default.svc.cluster.local/::/http
The Istio namer reads service discovery information from the Istio-Pilot's Service Discvoery Service API. https://lyft.github.io/envoy/docs/configuration/cluster_manager/sds_api.html Each lookup is backed by a polling loop.