stefanprodan 0032c14a78 Refactor metrics ...

- add observer interface with builtin metrics functions
- add metrics observer factory
- add prometheus client
- implement the observer interface for istio, envoy and nginx
- remove deprecated istio and app mesh metric aliases (istio_requests_total, istio_request_duration_seconds_bucket, envoy_cluster_upstream_rq, envoy_cluster_upstream_rq_time_bucket)

2019-05-13 17:34:08 +03:00

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